diff --git a/src/dynamic_data/flow/choice_queue.rs b/src/dynamic_data/flow/choice_queue.rs
index 7908d1f..8d1f7df 100755
--- a/src/dynamic_data/flow/choice_queue.rs
+++ b/src/dynamic_data/flow/choice_queue.rs
@@ -132,8 +132,8 @@ impl ValueIdentifiable for ChoiceQueue {
 mod tests {
     use super::*;
     use crate::defines::LevelInt;
-    use crate::dynamic_data::PassChoice;
-    use crate::static_data::{AbilityIndex, DataLibrary, Gender};
+    use crate::dynamic_data::{DynamicLibrary, PassChoice};
+    use crate::static_data::{AbilityIndex, Gender};
     use std::sync::Arc;
 
     #[test]
diff --git a/src/dynamic_data/flow/turn_runner.rs b/src/dynamic_data/flow/turn_runner.rs
index b976efa..e2fe9c4 100755
--- a/src/dynamic_data/flow/turn_runner.rs
+++ b/src/dynamic_data/flow/turn_runner.rs
@@ -9,7 +9,7 @@ use crate::dynamic_data::Battle;
 use crate::dynamic_data::DamageSource;
 use crate::dynamic_data::ExecutingMove;
 use crate::dynamic_data::Pokemon;
-use crate::static_data::{DataLibrary, MoveCategory};
+use crate::static_data::MoveCategory;
 use crate::{run_scripts, script_hook, PkmnResult};
 
 impl Battle {
diff --git a/src/dynamic_data/libraries/battle_stat_calculator.rs b/src/dynamic_data/libraries/battle_stat_calculator.rs
index 0a79338..7fde222 100755
--- a/src/dynamic_data/libraries/battle_stat_calculator.rs
+++ b/src/dynamic_data/libraries/battle_stat_calculator.rs
@@ -137,3 +137,23 @@ impl ValueIdentifiable for Gen7BattleStatCalculator {
         self.identifier
     }
 }
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub BattleStatCalculator{}
+        impl BattleStatCalculator for BattleStatCalculator {
+            fn calculate_flat_stats(&self, pokemon: &Pokemon, stats: &StatisticSet<u32>);
+            fn calculate_flat_stat(&self, pokemon: &Pokemon, stat: Statistic) -> u32;
+            fn calculate_boosted_stats(&self, pokemon: &Pokemon, stats: &StatisticSet<u32>);
+            fn calculate_boosted_stat(&self, pokemon: &Pokemon, stat: Statistic) -> u32;
+        }
+        impl ValueIdentifiable for BattleStatCalculator {
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+}
diff --git a/src/dynamic_data/libraries/dynamic_library.rs b/src/dynamic_data/libraries/dynamic_library.rs
index fa710bb..0b7182c 100755
--- a/src/dynamic_data/libraries/dynamic_library.rs
+++ b/src/dynamic_data/libraries/dynamic_library.rs
@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 use std::ops::Deref;
 use std::sync::Arc;
 
@@ -11,14 +12,42 @@ use crate::static_data::Item;
 use crate::static_data::StaticData;
 use crate::{PkmnResult, StringKey, ValueIdentifiable, ValueIdentifier};
 
+/// The dynamic library stores a static data library, as well as holding different libraries and
+/// calculators that might be customized between different generations and implementations.
+pub trait DynamicLibrary: Debug + ValueIdentifiable {
+    /// The static data is the immutable storage data for this library.
+    fn static_data(&self) -> &Box<dyn StaticData>;
+    /// The stat calculator deals with the calculation of flat and boosted stats, based on the
+    /// Pokemons attributes.
+    fn stat_calculator(&self) -> &dyn BattleStatCalculator;
+    /// The damage calculator deals with the calculation of things relating to damage.
+    fn damage_calculator(&self) -> &dyn DamageLibrary;
+    /// The Misc Library holds minor functions that do not fall in any of the other libraries and
+    /// calculators.
+    fn misc_library(&self) -> &dyn MiscLibrary;
+
+    /// Loads a standard script with a given unique combination of category and key. If no script
+    /// can be created with this combination, returns None.
+    fn load_script(
+        &self,
+        owner: ScriptOwnerData,
+        _category: ScriptCategory,
+        _key: &StringKey,
+    ) -> PkmnResult<Option<Arc<dyn Script>>>;
+    /// Loads an item script with the given unique key. If no script can be created with this
+    /// combinations, returns None. Note that ItemScripts are immutable, as their script should be
+    /// shared between all different usages.
+    fn load_item_script(&self, _key: &Arc<dyn Item>) -> PkmnResult<Option<Arc<dyn ItemScript>>>;
+}
+
 /// The dynamic library stores a static data library, as well as holding different libraries and
 /// calculators that might be customized between different generations and implementations.
 #[derive(Debug)]
-pub struct DynamicLibrary {
+pub struct DynamicLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The static data is the immutable storage data for this library.
-    static_data: StaticData,
+    static_data: Box<dyn StaticData>,
     /// The stat calculator deals with the calculation of flat and boosted stats, based on the
     /// Pokemons attributes.
     stat_calculator: Box<dyn BattleStatCalculator>,
@@ -32,13 +61,10 @@ pub struct DynamicLibrary {
     script_resolver: Box<dyn ScriptResolver>,
 }
 
-unsafe impl Sync for DynamicLibrary {}
-unsafe impl Send for DynamicLibrary {}
-
-impl DynamicLibrary {
+impl DynamicLibraryImpl {
     /// Instantiates a new DynamicLibrary with given parameters.
     pub fn new(
-        static_data: StaticData,
+        static_data: Box<dyn StaticData>,
         stat_calculator: Box<dyn BattleStatCalculator>,
         damage_calculator: Box<dyn DamageLibrary>,
         misc_library: Box<dyn MiscLibrary>,
@@ -53,29 +79,31 @@ impl DynamicLibrary {
             script_resolver,
         }
     }
+}
 
+impl DynamicLibrary for DynamicLibraryImpl {
     /// The static data is the immutable storage data for this library.
-    pub fn static_data(&self) -> &StaticData {
+    fn static_data(&self) -> &Box<dyn StaticData> {
         &self.static_data
     }
     /// The stat calculator deals with the calculation of flat and boosted stats, based on the
     /// Pokemons attributes.
-    pub fn stat_calculator(&self) -> &dyn BattleStatCalculator {
+    fn stat_calculator(&self) -> &dyn BattleStatCalculator {
         self.stat_calculator.deref()
     }
     /// The damage calculator deals with the calculation of things relating to damage.
-    pub fn damage_calculator(&self) -> &dyn DamageLibrary {
+    fn damage_calculator(&self) -> &dyn DamageLibrary {
         self.damage_calculator.deref()
     }
     /// The Misc Library holds minor functions that do not fall in any of the other libraries and
     /// calculators.
-    pub fn misc_library(&self) -> &dyn MiscLibrary {
+    fn misc_library(&self) -> &dyn MiscLibrary {
         self.misc_library.deref()
     }
 
     /// Loads a standard script with a given unique combination of category and key. If no script
     /// can be created with this combination, returns None.
-    pub fn load_script(
+    fn load_script(
         &self,
         owner: ScriptOwnerData,
         _category: ScriptCategory,
@@ -86,12 +114,12 @@ impl DynamicLibrary {
     /// Loads an item script with the given unique key. If no script can be created with this
     /// combinations, returns None. Note that ItemScripts are immutable, as their script should be
     /// shared between all different usages.
-    pub fn load_item_script(&self, _key: &Arc<dyn Item>) -> PkmnResult<Option<Arc<dyn ItemScript>>> {
+    fn load_item_script(&self, _key: &Arc<dyn Item>) -> PkmnResult<Option<Arc<dyn ItemScript>>> {
         todo!()
     }
 }
 
-impl ValueIdentifiable for DynamicLibrary {
+impl ValueIdentifiable for DynamicLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -99,16 +127,39 @@ impl ValueIdentifiable for DynamicLibrary {
 
 #[cfg(test)]
 pub mod test {
+    use super::*;
     use crate::dynamic_data::libraries::battle_stat_calculator::Gen7BattleStatCalculator;
     use crate::dynamic_data::libraries::damage_library::Gen7DamageLibrary;
-    use crate::dynamic_data::libraries::dynamic_library::DynamicLibrary;
     use crate::dynamic_data::libraries::misc_library::Gen7MiscLibrary;
     use crate::dynamic_data::EmptyScriptResolver;
 
-    pub fn build() -> DynamicLibrary {
-        DynamicLibrary {
+    mockall::mock! {
+        #[derive(Debug)]
+        pub DynamicLibrary{}
+        impl DynamicLibrary for DynamicLibrary {
+            fn static_data(&self) -> &Box<dyn StaticData>;
+            fn stat_calculator(&self) -> &dyn BattleStatCalculator;
+            fn damage_calculator(&self) -> &dyn DamageLibrary;
+            fn misc_library(&self) -> &dyn MiscLibrary;
+            fn load_script(
+                &self,
+                owner: ScriptOwnerData,
+                _category: ScriptCategory,
+                _key: &StringKey,
+            ) -> PkmnResult<Option<Arc<dyn Script>>>;
+            fn load_item_script(&self, _key: &Arc<dyn Item>) -> PkmnResult<Option<Arc<dyn ItemScript>>>;
+        }
+        impl ValueIdentifiable for DynamicLibrary{
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+
+    pub fn build() -> DynamicLibraryImpl {
+        DynamicLibraryImpl {
             identifier: Default::default(),
-            static_data: crate::static_data::libraries::static_data::test::build(),
+            static_data: Box::new(crate::static_data::libraries::static_data::test::build()),
             stat_calculator: Box::new(Gen7BattleStatCalculator::new()),
             damage_calculator: Box::new(Gen7DamageLibrary::new(false)),
             misc_library: Box::new(Gen7MiscLibrary::new()),
diff --git a/src/dynamic_data/libraries/misc_library.rs b/src/dynamic_data/libraries/misc_library.rs
index 60c4a59..adf9d76 100755
--- a/src/dynamic_data/libraries/misc_library.rs
+++ b/src/dynamic_data/libraries/misc_library.rs
@@ -47,7 +47,7 @@ impl Gen7MiscLibrary {
             ))),
             HashSet::new(),
         ));
-        let struggle_learned_move = Arc::new(LearnedMove::new(&struggle_data, MoveLearnMethod::Unknown));
+        let struggle_learned_move = Arc::new(LearnedMove::new(struggle_data, MoveLearnMethod::Unknown));
         Self {
             identifier: Default::default(),
             struggle_learned_move,
diff --git a/src/dynamic_data/models/battle.rs b/src/dynamic_data/models/battle.rs
index d60247a..749c871 100755
--- a/src/dynamic_data/models/battle.rs
+++ b/src/dynamic_data/models/battle.rs
@@ -26,7 +26,7 @@ pub struct Battle {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The library the battle uses for handling.
-    library: Arc<DynamicLibrary>,
+    library: Arc<dyn DynamicLibrary>,
     /// A list of all different parties in the battle.
     parties: Vec<BattleParty>,
     /// Whether or not Pokemon can flee from the battle.
@@ -62,7 +62,7 @@ pub struct Battle {
 impl Battle {
     /// Initializes a new battle.
     pub fn new(
-        library: Arc<DynamicLibrary>,
+        library: Arc<dyn DynamicLibrary>,
         parties: Vec<BattleParty>,
         can_flee: bool,
         number_of_sides: u8,
@@ -110,7 +110,7 @@ impl Battle {
     }
 
     /// The library the battle uses for handling.
-    pub fn library(&self) -> &Arc<DynamicLibrary> {
+    pub fn library(&self) -> &Arc<dyn DynamicLibrary> {
         &self.library
     }
     /// A list of all different parties in the battle.
diff --git a/src/dynamic_data/models/learned_move.rs b/src/dynamic_data/models/learned_move.rs
index 4b9239f..e8e0d78 100755
--- a/src/dynamic_data/models/learned_move.rs
+++ b/src/dynamic_data/models/learned_move.rs
@@ -33,12 +33,13 @@ pub enum MoveLearnMethod {
 
 impl LearnedMove {
     /// Instantiate a new learned move.
-    pub fn new(move_data: &Arc<dyn MoveData>, learn_method: MoveLearnMethod) -> Self {
+    pub fn new(move_data: Arc<dyn MoveData>, learn_method: MoveLearnMethod) -> Self {
+        let max_pp = move_data.base_usages();
         Self {
             identifier: Default::default(),
-            move_data: move_data.clone(),
-            max_pp: move_data.base_usages(),
-            remaining_pp: AtomicU8::new(move_data.base_usages()),
+            move_data,
+            max_pp,
+            remaining_pp: AtomicU8::new(max_pp),
             learn_method,
         }
     }
@@ -107,7 +108,7 @@ mod tests {
         let mut mock = MockMoveData::new();
         mock.expect_base_usages().return_const(30);
         let data: Arc<dyn MoveData> = Arc::new(mock);
-        let learned_move = LearnedMove::new(&data, MoveLearnMethod::Level);
+        let learned_move = LearnedMove::new(data, MoveLearnMethod::Level);
         assert!(learned_move.try_use(15));
         learned_move.restore_uses(5);
         assert_eq!(20, learned_move.remaining_pp());
diff --git a/src/dynamic_data/models/pokemon.rs b/src/dynamic_data/models/pokemon.rs
index e634356..1c53ad1 100755
--- a/src/dynamic_data/models/pokemon.rs
+++ b/src/dynamic_data/models/pokemon.rs
@@ -12,6 +12,7 @@ use crate::dynamic_data::models::battle::Battle;
 use crate::dynamic_data::models::learned_move::{LearnedMove, MoveLearnMethod};
 use crate::dynamic_data::script_handling::{ScriptSource, ScriptSourceData, ScriptWrapper};
 use crate::dynamic_data::{DynamicLibrary, Script, ScriptCategory, ScriptContainer, ScriptSet, VolatileScriptsOwner};
+use crate::static_data::AbilityIndex;
 use crate::static_data::Form;
 use crate::static_data::Gender;
 use crate::static_data::Item;
@@ -19,7 +20,6 @@ use crate::static_data::Nature;
 use crate::static_data::Species;
 use crate::static_data::TypeIdentifier;
 use crate::static_data::{Ability, Statistic};
-use crate::static_data::{AbilityIndex, DataLibrary};
 use crate::static_data::{ClampedStatisticSet, StatisticSet};
 use crate::utils::Random;
 use crate::{script_hook, PkmnResult, StringKey, ValueIdentifiable, ValueIdentifier};
@@ -30,7 +30,7 @@ pub struct Pokemon {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The library data of the Pokemon.
-    library: Arc<DynamicLibrary>,
+    library: Arc<dyn DynamicLibrary>,
     /// The species of the Pokemon.
     species: RwLock<Arc<dyn Species>>,
     /// The form of the Pokemon.
@@ -120,7 +120,7 @@ pub struct Pokemon {
 impl Pokemon {
     /// Instantiates a new Pokemon.
     pub fn new(
-        library: Arc<DynamicLibrary>,
+        library: Arc<dyn DynamicLibrary>,
         species: Arc<dyn Species>,
         form: &Arc<dyn Form>,
         ability: AbilityIndex,
@@ -188,7 +188,7 @@ impl Pokemon {
     }
 
     /// The library data of the Pokemon.
-    pub fn library(&self) -> &Arc<DynamicLibrary> {
+    pub fn library(&self) -> &Arc<dyn DynamicLibrary> {
         &self.library
     }
     /// The species of the Pokemon.
@@ -416,9 +416,9 @@ impl Pokemon {
         self.override_ability.is_some()
     }
     /// Returns the currently active ability.
-    pub fn active_ability(&self) -> &Arc<dyn Ability> {
+    pub fn active_ability(&self) -> Arc<dyn Ability> {
         if let Some(v) = &self.override_ability {
-            return v;
+            return v.clone();
         }
         self.library
             .static_data()
@@ -523,7 +523,7 @@ impl Pokemon {
                 .set(ability_script)
                 .as_ref()
                 // Ensure the ability script gets initialized with the parameters for the ability.
-                .on_initialize(self.library.as_ref(), self.active_ability().parameters().to_vec())
+                .on_initialize(&self.library, self.active_ability().parameters().to_vec())
         } else {
             self.ability_script.clear();
         }
@@ -829,14 +829,69 @@ pub enum DamageSource {
 
 #[cfg(test)]
 pub mod test {
+    use crate::dynamic_data::libraries::test::MockDynamicLibrary;
     use crate::dynamic_data::models::pokemon::Pokemon;
-    use crate::static_data::Gender;
-    use crate::static_data::{AbilityIndex, DataLibrary};
+    use crate::dynamic_data::tests::MockBattleStatCalculator;
+    use crate::dynamic_data::DynamicLibrary;
+    use crate::static_data::growth_rate_library::tests::MockGrowthRateLibrary;
+    use crate::static_data::nature_library::tests::MockNatureLibrary;
+    use crate::static_data::species_library::tests::MockSpeciesLibrary;
+    use crate::static_data::test::MockStaticData;
+    use crate::static_data::tests::{MockForm, MockNature, MockSpecies};
+    use crate::static_data::{AbilityIndex, Species};
+    use crate::static_data::{Form, Gender};
+    use crate::StringKey;
     use std::sync::Arc;
 
+    pub fn mock_library() -> Arc<dyn DynamicLibrary> {
+        let mut species_lib = MockSpeciesLibrary::new();
+        species_lib.expect_get().return_once(|_| {
+            let mut species = MockSpecies::new();
+            species.expect_get_form().return_once(|_| {
+                let mut form = MockForm::new();
+                form.expect_name().return_const(StringKey::new("default"));
+                form.expect_weight().return_const(100.0);
+                form.expect_height().return_const(20.0);
+                form.expect_types().return_const(vec![0u8.into()]);
+                let a: Arc<dyn Form> = Arc::new(form);
+                Some(a)
+            });
+            species.expect_growth_rate().return_const(StringKey::empty());
+            species.expect_name().return_const(StringKey::new("test_species"));
+
+            let s: Arc<dyn Species> = Arc::new(species);
+            Some(s)
+        });
+
+        let mut static_lib = MockStaticData::new();
+        static_lib.expect_species().return_const(Box::new(species_lib));
+
+        let mut growth_rate_lib = MockGrowthRateLibrary::new();
+        growth_rate_lib.expect_calculate_experience().return_const(1000u32);
+
+        let mut nature_lib = MockNatureLibrary::new();
+        nature_lib.expect_get_nature().returning(|_| {
+            let n = MockNature::new();
+            Some(Arc::new(n))
+        });
+
+        static_lib.expect_growth_rates().return_const(Box::new(growth_rate_lib));
+        static_lib.expect_natures().return_const(Box::new(nature_lib));
+
+        let mut stat_calculator = MockBattleStatCalculator::new();
+        stat_calculator.expect_calculate_flat_stats().returning(|_, _| {});
+        stat_calculator.expect_calculate_boosted_stats().returning(|_, _| {});
+
+        let mut lib = MockDynamicLibrary::new();
+        lib.expect_static_data().return_const(Box::new(static_lib));
+        lib.expect_stat_calculator().return_const(Box::new(stat_calculator));
+
+        Arc::new(lib)
+    }
+
     #[test]
     fn construct_pokemon() {
-        let lib = Arc::new(crate::dynamic_data::libraries::dynamic_library::test::build());
+        let lib = mock_library();
         let species = lib.static_data().species().get(&"foo".into()).unwrap().clone();
         let form = species.get_form(&"default".into()).unwrap();
 
@@ -854,7 +909,7 @@ pub mod test {
             0,
             &"test_nature".into(),
         );
-        assert_eq!(pokemon.species().name(), &"foo".into());
+        assert_eq!(pokemon.species().name(), &"test_species".into());
         assert_eq!(pokemon.form().name(), &"default".into());
     }
 }
diff --git a/src/dynamic_data/models/pokemon_builder.rs b/src/dynamic_data/models/pokemon_builder.rs
index 7b45872..7462aa1 100755
--- a/src/dynamic_data/models/pokemon_builder.rs
+++ b/src/dynamic_data/models/pokemon_builder.rs
@@ -4,13 +4,13 @@ use crate::defines::LevelInt;
 use crate::dynamic_data::models::learned_move::MoveLearnMethod;
 use crate::dynamic_data::models::pokemon::Pokemon;
 use crate::dynamic_data::DynamicLibrary;
-use crate::static_data::{AbilityIndex, DataLibrary, Gender};
+use crate::static_data::{AbilityIndex, Gender};
 use crate::{Random, StringKey};
 
 /// This allows for the easy chain building of a Pokemon.
 pub struct PokemonBuilder {
     /// The library of the Pokemon.
-    library: Arc<DynamicLibrary>,
+    library: Arc<dyn DynamicLibrary>,
     /// The name of the species of the Pokemon.
     species: StringKey,
     /// The level of the Pokemon.
@@ -23,7 +23,7 @@ pub struct PokemonBuilder {
 
 impl PokemonBuilder {
     /// Creates a new PokemonBuilder with a library, species, and level.
-    pub fn new(library: Arc<DynamicLibrary>, species: StringKey, level: LevelInt) -> Self {
+    pub fn new(library: Arc<dyn DynamicLibrary>, species: StringKey, level: LevelInt) -> Self {
         Self {
             library,
             species,
diff --git a/src/dynamic_data/script_handling/script.rs b/src/dynamic_data/script_handling/script.rs
index 9fd2647..401584d 100755
--- a/src/dynamic_data/script_handling/script.rs
+++ b/src/dynamic_data/script_handling/script.rs
@@ -64,7 +64,7 @@ pub trait Script: Send + Sync {
     /// This function is ran when this script stops being in effect, and is removed from its owner.
     fn on_remove(&self) {}
     /// This function is ran when this script starts being in effect.
-    fn on_initialize(&self, _library: &DynamicLibrary, _pars: Vec<EffectParameter>) {}
+    fn on_initialize(&self, _library: &Arc<dyn DynamicLibrary>, _pars: Vec<EffectParameter>) {}
     /// This function is ran just before the start of the turn. Everyone has made its choices here,
     /// and the turn is about to start. This is a great place to initialize data if you need to know
     /// something has happened during a turn.
diff --git a/src/ffi/dynamic_data/libraries/dynamic_library.rs b/src/ffi/dynamic_data/libraries/dynamic_library.rs
index 48a2733..aeab133 100644
--- a/src/ffi/dynamic_data/libraries/dynamic_library.rs
+++ b/src/ffi/dynamic_data/libraries/dynamic_library.rs
@@ -1,4 +1,6 @@
-use crate::dynamic_data::{BattleStatCalculator, DamageLibrary, DynamicLibrary, MiscLibrary, ScriptResolver};
+use crate::dynamic_data::{
+    BattleStatCalculator, DamageLibrary, DynamicLibrary, DynamicLibraryImpl, MiscLibrary, ScriptResolver,
+};
 use crate::ffi::{IdentifiablePointer, OwnedPtr};
 use crate::static_data::StaticData;
 use std::sync::Arc;
@@ -6,20 +8,20 @@ use std::sync::Arc;
 /// Instantiates a new DynamicLibrary with given parameters.
 #[no_mangle]
 extern "C" fn dynamic_library_new(
-    static_data: OwnedPtr<StaticData>,
+    static_data: OwnedPtr<Box<dyn StaticData>>,
     stat_calculator: OwnedPtr<Box<dyn BattleStatCalculator>>,
     damage_library: OwnedPtr<Box<dyn DamageLibrary>>,
     misc_library: OwnedPtr<Box<dyn MiscLibrary>>,
     script_resolver: OwnedPtr<Box<dyn ScriptResolver>>,
-) -> IdentifiablePointer<Arc<DynamicLibrary>> {
+) -> IdentifiablePointer<Arc<dyn DynamicLibrary>> {
     unsafe {
-        Arc::new(DynamicLibrary::new(
+        let a: Arc<dyn DynamicLibrary> = Arc::new(DynamicLibraryImpl::new(
             *Box::from_raw(static_data),
             *Box::from_raw(stat_calculator),
             *Box::from_raw(damage_library),
             *Box::from_raw(misc_library),
             *Box::from_raw(script_resolver),
-        ))
-        .into()
+        ));
+        a.into()
     }
 }
diff --git a/src/ffi/dynamic_data/models/battle.rs b/src/ffi/dynamic_data/models/battle.rs
index 3e7a952..69423fd 100644
--- a/src/ffi/dynamic_data/models/battle.rs
+++ b/src/ffi/dynamic_data/models/battle.rs
@@ -9,7 +9,7 @@ use std::sync::Arc;
 /// Initializes a new battle.
 #[no_mangle]
 extern "C" fn battle_new(
-    library: ExternPointer<Arc<DynamicLibrary>>,
+    library: ExternPointer<Arc<dyn DynamicLibrary>>,
     parties: *const OwnedPtr<BattleParty>,
     parties_length: usize,
     can_flee: u8,
@@ -46,7 +46,7 @@ extern "C" fn battle_new(
 
 /// The library the battle uses for handling.
 #[no_mangle]
-extern "C" fn battle_library(ptr: ExternPointer<Arc<Battle>>) -> IdentifiablePointer<Arc<DynamicLibrary>> {
+extern "C" fn battle_library(ptr: ExternPointer<Arc<Battle>>) -> IdentifiablePointer<Arc<dyn DynamicLibrary>> {
     ptr.as_ref().library().clone().into()
 }
 
diff --git a/src/ffi/dynamic_data/models/learned_move.rs b/src/ffi/dynamic_data/models/learned_move.rs
index 6b3048c..803a2fa 100644
--- a/src/ffi/dynamic_data/models/learned_move.rs
+++ b/src/ffi/dynamic_data/models/learned_move.rs
@@ -10,7 +10,7 @@ extern "C" fn learned_move_new(
     move_data: ExternPointer<Arc<dyn MoveData>>,
     learn_method: MoveLearnMethod,
 ) -> IdentifiablePointer<Arc<LearnedMove>> {
-    Arc::new(LearnedMove::new(move_data.as_ref(), learn_method)).into()
+    Arc::new(LearnedMove::new(move_data.as_ref().clone(), learn_method)).into()
 }
 
 /// Drops a learned move.
diff --git a/src/ffi/dynamic_data/models/pokemon.rs b/src/ffi/dynamic_data/models/pokemon.rs
index ce100c6..0cfe86c 100644
--- a/src/ffi/dynamic_data/models/pokemon.rs
+++ b/src/ffi/dynamic_data/models/pokemon.rs
@@ -11,7 +11,7 @@ use std::sync::Arc;
 /// Instantiates a new Pokemon.
 #[no_mangle]
 extern "C" fn pokemon_new(
-    library: ExternPointer<Arc<DynamicLibrary>>,
+    library: ExternPointer<Arc<dyn DynamicLibrary>>,
     species: ExternPointer<Arc<dyn Species>>,
     form: ExternPointer<Arc<dyn Form>>,
     hidden_ability: bool,
@@ -48,7 +48,7 @@ unsafe extern "C" fn pokemon_drop(ptr: OwnedPtr<Arc<Pokemon>>) {
 
 /// The library data of the Pokemon.
 #[no_mangle]
-extern "C" fn pokemon_library(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<DynamicLibrary>> {
+extern "C" fn pokemon_library(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<dyn DynamicLibrary>> {
     ptr.as_ref().library().clone().into()
 }
 
diff --git a/src/ffi/mod.rs b/src/ffi/mod.rs
index 0acb584..ded4755 100644
--- a/src/ffi/mod.rs
+++ b/src/ffi/mod.rs
@@ -163,6 +163,16 @@ impl<T: ValueIdentifiable + ?Sized> From<Box<T>> for IdentifiablePointer<Box<T>>
     }
 }
 
+impl<T: ValueIdentifiable + ?Sized> From<&Box<T>> for IdentifiablePointer<Box<T>> {
+    fn from(v: &Box<T>) -> Self {
+        let id = unsafe { transmute(v.value_identifier()) };
+        Self {
+            ptr: v as *const Box<T>,
+            id,
+        }
+    }
+}
+
 impl<T: ValueIdentifiable + ?Sized> From<Option<Box<T>>> for IdentifiablePointer<Box<T>> {
     fn from(v: Option<Box<T>>) -> Self {
         if let Some(v) = v {
diff --git a/src/ffi/static_data/libraries/growth_rate_library.rs b/src/ffi/static_data/libraries/growth_rate_library.rs
index 77a6bba..ffd9774 100644
--- a/src/ffi/static_data/libraries/growth_rate_library.rs
+++ b/src/ffi/static_data/libraries/growth_rate_library.rs
@@ -1,25 +1,26 @@
 use crate::defines::LevelInt;
 use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr};
-use crate::static_data::{GrowthRate, GrowthRateLibrary};
+use crate::static_data::{GrowthRate, GrowthRateLibrary, GrowthRateLibraryImpl};
 use std::ffi::{c_char, CStr};
 use std::ptr::drop_in_place;
 
 /// Instantiates a new growth rate library with a capacity
 #[no_mangle]
-extern "C" fn growth_rate_library_new(capacity: usize) -> IdentifiablePointer<GrowthRateLibrary> {
-    Box::new(GrowthRateLibrary::new(capacity)).into()
+extern "C" fn growth_rate_library_new(capacity: usize) -> IdentifiablePointer<Box<dyn GrowthRateLibrary>> {
+    let b: Box<dyn GrowthRateLibrary> = Box::new(GrowthRateLibraryImpl::new(capacity));
+    b.into()
 }
 
 /// Drops the growthrate library.
 #[no_mangle]
-unsafe extern "C" fn growth_rate_library_drop(ptr: OwnedPtr<GrowthRateLibrary>) {
+unsafe extern "C" fn growth_rate_library_drop(ptr: OwnedPtr<Box<dyn GrowthRateLibrary>>) {
     drop_in_place(ptr)
 }
 
 /// Calculates the level for a given growth key name and a certain experience.
 #[no_mangle]
 unsafe extern "C" fn growth_rate_library_calculate_level(
-    ptr: ExternPointer<GrowthRateLibrary>,
+    ptr: ExternPointer<Box<dyn GrowthRateLibrary>>,
     growth_rate: BorrowedPtr<c_char>,
     experience: u32,
 ) -> LevelInt {
@@ -30,7 +31,7 @@ unsafe extern "C" fn growth_rate_library_calculate_level(
 /// Calculates the experience for a given growth key name and a certain level.
 #[no_mangle]
 unsafe extern "C" fn growth_rate_library_calculate_experience(
-    ptr: ExternPointer<GrowthRateLibrary>,
+    ptr: ExternPointer<Box<dyn GrowthRateLibrary>>,
     growth_rate: BorrowedPtr<c_char>,
     level: LevelInt,
 ) -> u32 {
@@ -41,7 +42,7 @@ unsafe extern "C" fn growth_rate_library_calculate_experience(
 /// Adds a new growth rate with a name and value.
 #[no_mangle]
 unsafe extern "C" fn growth_rate_library_add_growth_rate(
-    mut ptr: ExternPointer<GrowthRateLibrary>,
+    mut ptr: ExternPointer<Box<dyn GrowthRateLibrary>>,
     name: BorrowedPtr<c_char>,
     growth_rate: OwnedPtr<Box<dyn GrowthRate>>,
 ) {
diff --git a/src/ffi/static_data/libraries/library_settings.rs b/src/ffi/static_data/libraries/library_settings.rs
index 64dd4e8..a5b7b8d 100644
--- a/src/ffi/static_data/libraries/library_settings.rs
+++ b/src/ffi/static_data/libraries/library_settings.rs
@@ -1,22 +1,23 @@
 use crate::defines::LevelInt;
 use crate::ffi::{ExternPointer, IdentifiablePointer, OwnedPtr};
-use crate::static_data::LibrarySettings;
+use crate::static_data::{LibrarySettings, LibrarySettingsImpl};
 use std::ptr::drop_in_place;
 
 /// Creates a new settings library.
 #[no_mangle]
-extern "C" fn library_settings_new(max_level: LevelInt) -> IdentifiablePointer<LibrarySettings> {
-    Box::new(LibrarySettings::new(max_level)).into()
+extern "C" fn library_settings_new(max_level: LevelInt) -> IdentifiablePointer<Box<dyn LibrarySettings>> {
+    let b: Box<dyn LibrarySettings> = Box::new(LibrarySettingsImpl::new(max_level));
+    b.into()
 }
 
 /// Drop a library settings object.
 #[no_mangle]
-unsafe extern "C" fn library_settings_drop(ptr: OwnedPtr<LibrarySettings>) {
+unsafe extern "C" fn library_settings_drop(ptr: OwnedPtr<Box<dyn LibrarySettings>>) {
     drop_in_place(ptr)
 }
 
 /// The highest level a Pokemon can be.
 #[no_mangle]
-extern "C" fn library_settings_maximum_level(ptr: ExternPointer<LibrarySettings>) -> LevelInt {
+extern "C" fn library_settings_maximum_level(ptr: ExternPointer<Box<dyn LibrarySettings>>) -> LevelInt {
     ptr.as_ref().maximum_level()
 }
diff --git a/src/ffi/static_data/libraries/mod.rs b/src/ffi/static_data/libraries/mod.rs
index 1b54cac..6c04091 100644
--- a/src/ffi/static_data/libraries/mod.rs
+++ b/src/ffi/static_data/libraries/mod.rs
@@ -17,32 +17,33 @@ use std::sync::Arc;
 
 /// Generates foreign function interfaces for a DataLibrary trait implementation.
 macro_rules! library_interface {
-    ($library_type:ty, $return_type:ty) => {
+    ($library_type_name:ident, $library_type:ty, $return_type:ty) => {
         paste::paste! {
             #[no_mangle]
-            extern "C" fn [< $library_type:snake _new >](capacity: usize) -> IdentifiablePointer<$library_type> {
-                Box::new($library_type::new(capacity)).into()
+            extern "C" fn [< $library_type_name:snake _new >](capacity: usize) -> IdentifiablePointer<$library_type> {
+                let value: $library_type = Box::new([<$library_type_name Impl>]::new(capacity));
+                value.into()
             }
 
             #[no_mangle]
-            unsafe extern "C" fn [< $library_type:snake _drop >](ptr: OwnedPtr<$library_type>) {
+            unsafe extern "C" fn [< $library_type_name:snake _drop >](ptr: OwnedPtr<$library_type>) {
                 drop_in_place(ptr);
             }
 
             #[no_mangle]
-            unsafe extern "C" fn [< $library_type:snake _add >](ptr: OwnedPtr<$library_type>, key: BorrowedPtr<c_char>, value: OwnedPtr<Arc<$return_type>>) {
+            unsafe extern "C" fn [< $library_type_name:snake _add >](ptr: OwnedPtr<$library_type>, key: BorrowedPtr<c_char>, value: OwnedPtr<Arc<$return_type>>) {
                 let lib = ptr.as_mut().unwrap();
                 lib.add(&CStr::from_ptr(key).into(), *Box::from_raw(value));
             }
 
             #[no_mangle]
-            unsafe extern "C" fn [< $library_type:snake _remove >](ptr: OwnedPtr<$library_type>, key: BorrowedPtr<c_char>) {
+            unsafe extern "C" fn [< $library_type_name:snake _remove >](ptr: OwnedPtr<$library_type>, key: BorrowedPtr<c_char>) {
                 let lib = ptr.as_mut().unwrap();
                 lib.remove(&CStr::from_ptr(key).into());
             }
 
             #[no_mangle]
-            unsafe extern "C" fn [< $library_type:snake _get >](ptr: OwnedPtr<$library_type>, key: BorrowedPtr<c_char>) -> IdentifiablePointer<Arc<$return_type>> {
+            unsafe extern "C" fn [< $library_type_name:snake _get >](ptr: OwnedPtr<$library_type>, key: BorrowedPtr<c_char>) -> IdentifiablePointer<Arc<$return_type>> {
                 let lib = ptr.as_mut().unwrap();
                 let v = lib.get(&CStr::from_ptr(key).into());
                 if let Some(value) = v {
@@ -53,7 +54,7 @@ macro_rules! library_interface {
             }
 
             #[no_mangle]
-            unsafe extern "C" fn [< $library_type:snake _get_key_by_index >](ptr: OwnedPtr<$library_type>, index: usize) -> OwnedPtr<c_char> {
+            unsafe extern "C" fn [< $library_type_name:snake _get_key_by_index >](ptr: OwnedPtr<$library_type>, index: usize) -> OwnedPtr<c_char> {
                 let lib = ptr.as_mut().unwrap();
                 let v = lib.get_key_by_index(index);
                 if let Some(value) = v {
@@ -64,7 +65,7 @@ macro_rules! library_interface {
             }
 
             #[no_mangle]
-            unsafe extern "C" fn [< $library_type:snake _len >](ptr: OwnedPtr<$library_type>) -> usize {
+            unsafe extern "C" fn [< $library_type_name:snake _len >](ptr: OwnedPtr<$library_type>) -> usize {
                 let lib = ptr.as_mut().unwrap();
                 lib.len()
             }
@@ -72,7 +73,7 @@ macro_rules! library_interface {
     };
 }
 
-library_interface!(SpeciesLibrary, dyn Species);
-library_interface!(MoveLibrary, dyn MoveData);
-library_interface!(AbilityLibrary, dyn Ability);
-library_interface!(ItemLibrary, dyn Item);
+library_interface!(SpeciesLibrary, Box<dyn SpeciesLibrary>, dyn Species);
+library_interface!(MoveLibrary, Box<dyn MoveLibrary>, dyn MoveData);
+library_interface!(AbilityLibrary, Box<dyn AbilityLibrary>, dyn Ability);
+library_interface!(ItemLibrary, Box<dyn ItemLibrary>, dyn Item);
diff --git a/src/ffi/static_data/libraries/nature_library.rs b/src/ffi/static_data/libraries/nature_library.rs
index 602decf..5d93739 100644
--- a/src/ffi/static_data/libraries/nature_library.rs
+++ b/src/ffi/static_data/libraries/nature_library.rs
@@ -1,25 +1,26 @@
 use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr};
-use crate::static_data::{Nature, NatureLibrary};
+use crate::static_data::{Nature, NatureLibrary, NatureLibraryImpl};
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
 use std::sync::Arc;
 
 /// Creates a new nature library with a given capacity.
 #[no_mangle]
-extern "C" fn nature_library_new(capacity: usize) -> IdentifiablePointer<NatureLibrary> {
-    Box::new(NatureLibrary::new(capacity)).into()
+extern "C" fn nature_library_new(capacity: usize) -> IdentifiablePointer<Box<dyn NatureLibrary>> {
+    let b: Box<dyn NatureLibrary> = Box::new(NatureLibraryImpl::new(capacity));
+    b.into()
 }
 
 /// Drop a nature library.
 #[no_mangle]
-unsafe extern "C" fn nature_library_drop(ptr: OwnedPtr<NatureLibrary>) {
+unsafe extern "C" fn nature_library_drop(ptr: OwnedPtr<Box<dyn NatureLibrary>>) {
     drop_in_place(ptr);
 }
 
 /// Adds a new nature with name to the library.
 #[no_mangle]
 unsafe extern "C" fn nature_library_load_nature(
-    mut ptr: ExternPointer<NatureLibrary>,
+    mut ptr: ExternPointer<Box<dyn NatureLibrary>>,
     name: BorrowedPtr<c_char>,
     nature: OwnedPtr<Arc<dyn Nature>>,
 ) {
@@ -30,7 +31,7 @@ unsafe extern "C" fn nature_library_load_nature(
 /// Gets a nature by name.
 #[no_mangle]
 unsafe extern "C" fn nature_library_get_nature(
-    ptr: ExternPointer<NatureLibrary>,
+    ptr: ExternPointer<Box<dyn NatureLibrary>>,
     name: BorrowedPtr<c_char>,
 ) -> IdentifiablePointer<Arc<dyn Nature>> {
     if let Some(nature) = ptr.as_ref().get_nature(&CStr::from_ptr(name).into()) {
@@ -43,7 +44,7 @@ unsafe extern "C" fn nature_library_get_nature(
 /// Finds a nature name by nature.
 #[no_mangle]
 unsafe extern "C" fn nature_library_get_nature_name(
-    ptr: ExternPointer<NatureLibrary>,
+    ptr: ExternPointer<Box<dyn NatureLibrary>>,
     nature: BorrowedPtr<Arc<dyn Nature>>,
 ) -> OwnedPtr<c_char> {
     CString::new(ptr.as_ref().get_nature_name(nature.as_ref().unwrap()).str())
diff --git a/src/ffi/static_data/libraries/static_data.rs b/src/ffi/static_data/libraries/static_data.rs
index c99f337..8bb377d 100644
--- a/src/ffi/static_data/libraries/static_data.rs
+++ b/src/ffi/static_data/libraries/static_data.rs
@@ -1,68 +1,85 @@
 use crate::ffi::{ExternPointer, IdentifiablePointer, OwnedPtr};
 use crate::static_data::{
     AbilityLibrary, GrowthRateLibrary, ItemLibrary, LibrarySettings, MoveLibrary, NatureLibrary, SpeciesLibrary,
-    StaticData, TypeLibrary,
+    StaticData, StaticDataImpl, TypeLibrary,
 };
 use std::ptr::drop_in_place;
 
 /// Instantiates a new data collection.
 #[no_mangle]
-unsafe extern "C" fn static_data_new(settings: OwnedPtr<LibrarySettings>) -> IdentifiablePointer<StaticData> {
-    Box::new(StaticData::new(*Box::from_raw(settings))).into()
+unsafe extern "C" fn static_data_new(
+    settings: OwnedPtr<Box<dyn LibrarySettings>>,
+) -> IdentifiablePointer<Box<dyn StaticData>> {
+    let b: Box<dyn StaticData> = Box::new(StaticDataImpl::new(*Box::from_raw(settings)));
+    b.into()
 }
 
 /// Drop a static data.
 #[no_mangle]
-unsafe extern "C" fn static_data_drop(ptr: OwnedPtr<StaticData>) {
+unsafe extern "C" fn static_data_drop(ptr: OwnedPtr<Box<dyn StaticData>>) {
     drop_in_place(ptr)
 }
 
 /// Several misc settings for the library.
 #[no_mangle]
-unsafe extern "C" fn static_data_settings(mut data: ExternPointer<StaticData>) -> IdentifiablePointer<LibrarySettings> {
-    (data.as_mut().settings() as *const LibrarySettings).into()
+unsafe extern "C" fn static_data_settings(
+    mut data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn LibrarySettings>> {
+    data.as_mut().settings().into()
 }
 
 /// All data for Pokemon species.
 #[no_mangle]
-unsafe extern "C" fn static_data_species(mut data: ExternPointer<StaticData>) -> IdentifiablePointer<SpeciesLibrary> {
-    (data.as_mut().species_mut() as *const SpeciesLibrary).into()
+unsafe extern "C" fn static_data_species(
+    mut data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn SpeciesLibrary>> {
+    data.as_mut().species().into()
 }
 
 /// All data for the moves.
 #[no_mangle]
-unsafe extern "C" fn static_data_moves(mut data: ExternPointer<StaticData>) -> IdentifiablePointer<MoveLibrary> {
-    (data.as_mut().moves_mut() as *const MoveLibrary).into()
+unsafe extern "C" fn static_data_moves(
+    mut data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn MoveLibrary>> {
+    data.as_mut().moves().into()
 }
 
 /// All data for the items.
 #[no_mangle]
-unsafe extern "C" fn static_data_items(mut data: ExternPointer<StaticData>) -> IdentifiablePointer<ItemLibrary> {
-    (data.as_mut().items_mut() as *const ItemLibrary).into()
+unsafe extern "C" fn static_data_items(
+    mut data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn ItemLibrary>> {
+    (data.as_mut().items()).into()
 }
 
 /// All data for growth rates.
 #[no_mangle]
 unsafe extern "C" fn static_data_growth_rates(
-    mut data: ExternPointer<StaticData>,
-) -> IdentifiablePointer<GrowthRateLibrary> {
-    (data.as_mut().growth_rates_mut() as *const GrowthRateLibrary).into()
+    mut data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn GrowthRateLibrary>> {
+    data.as_mut().growth_rates().into()
 }
 
 /// All data related to types and type effectiveness.
 #[no_mangle]
-unsafe extern "C" fn static_data_types(mut data: ExternPointer<StaticData>) -> IdentifiablePointer<TypeLibrary> {
-    (data.as_mut().types_mut() as *const TypeLibrary).into()
+unsafe extern "C" fn static_data_types(
+    mut data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn TypeLibrary>> {
+    data.as_mut().types().into()
 }
 
 /// All data related to natures.
 #[no_mangle]
-unsafe extern "C" fn static_data_natures(mut data: ExternPointer<StaticData>) -> IdentifiablePointer<NatureLibrary> {
-    (data.as_mut().natures_mut() as *const NatureLibrary).into()
+unsafe extern "C" fn static_data_natures(
+    data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn NatureLibrary>> {
+    data.as_ref().natures().into()
 }
 
 /// All data related to abilities.
 #[no_mangle]
-unsafe extern "C" fn static_data_abilities(mut data: ExternPointer<StaticData>) -> IdentifiablePointer<AbilityLibrary> {
-    (data.as_mut().abilities_mut() as *const AbilityLibrary).into()
+unsafe extern "C" fn static_data_abilities(
+    mut data: ExternPointer<Box<dyn StaticData>>,
+) -> IdentifiablePointer<Box<dyn AbilityLibrary>> {
+    (data.as_mut().abilities()).into()
 }
diff --git a/src/ffi/static_data/libraries/type_library.rs b/src/ffi/static_data/libraries/type_library.rs
index 9b08b6c..5a9c5ae 100644
--- a/src/ffi/static_data/libraries/type_library.rs
+++ b/src/ffi/static_data/libraries/type_library.rs
@@ -1,24 +1,25 @@
 use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr};
-use crate::static_data::{TypeIdentifier, TypeLibrary};
+use crate::static_data::{TypeIdentifier, TypeLibrary, TypeLibraryImpl};
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
 
 /// Instantiates a new type library with a specific capacity.
 #[no_mangle]
-extern "C" fn type_library_new(capacity: usize) -> IdentifiablePointer<TypeLibrary> {
-    Box::new(TypeLibrary::new(capacity)).into()
+extern "C" fn type_library_new(capacity: usize) -> IdentifiablePointer<Box<dyn TypeLibrary>> {
+    let b: Box<dyn TypeLibrary> = Box::new(TypeLibraryImpl::new(capacity));
+    b.into()
 }
 
 /// Drops a type library.
 #[no_mangle]
-unsafe extern "C" fn type_library_drop(ptr: OwnedPtr<TypeLibrary>) {
+unsafe extern "C" fn type_library_drop(ptr: OwnedPtr<Box<dyn TypeLibrary>>) {
     drop_in_place(ptr);
 }
 
 /// Gets the type identifier for a type with a name.
 #[no_mangle]
 unsafe extern "C" fn type_library_get_type_id(
-    ptr: ExternPointer<TypeLibrary>,
+    ptr: ExternPointer<Box<dyn TypeLibrary>>,
     key: BorrowedPtr<c_char>,
     found: *mut bool,
 ) -> TypeIdentifier {
@@ -34,7 +35,7 @@ unsafe extern "C" fn type_library_get_type_id(
 /// Gets the type name from the type identifier.
 #[no_mangle]
 unsafe extern "C" fn type_library_get_type_name(
-    ptr: ExternPointer<TypeLibrary>,
+    ptr: ExternPointer<Box<dyn TypeLibrary>>,
     type_id: TypeIdentifier,
     found: *mut bool,
 ) -> *mut c_char {
@@ -50,7 +51,7 @@ unsafe extern "C" fn type_library_get_type_name(
 /// Gets the effectiveness for a single attacking type against a single defending type.
 #[no_mangle]
 extern "C" fn type_library_get_single_effectiveness(
-    ptr: ExternPointer<TypeLibrary>,
+    ptr: ExternPointer<Box<dyn TypeLibrary>>,
     attacking: TypeIdentifier,
     defending: TypeIdentifier,
 ) -> f32 {
@@ -62,7 +63,7 @@ extern "C" fn type_library_get_single_effectiveness(
 /// and multiplying the results with each other.
 #[no_mangle]
 unsafe extern "C" fn type_library_get_effectiveness(
-    ptr: ExternPointer<TypeLibrary>,
+    ptr: ExternPointer<Box<dyn TypeLibrary>>,
     attacking: TypeIdentifier,
     defending: OwnedPtr<TypeIdentifier>,
     defending_length: usize,
@@ -74,7 +75,7 @@ unsafe extern "C" fn type_library_get_effectiveness(
 /// Registers a new type in the library.
 #[no_mangle]
 unsafe extern "C" fn type_library_register_type(
-    mut ptr: ExternPointer<TypeLibrary>,
+    mut ptr: ExternPointer<Box<dyn TypeLibrary>>,
     name: BorrowedPtr<c_char>,
 ) -> TypeIdentifier {
     ptr.as_mut().register_type(&CStr::from_ptr(name).into())
@@ -83,7 +84,7 @@ unsafe extern "C" fn type_library_register_type(
 /// Sets the effectiveness for an attacking type against a defending type.
 #[no_mangle]
 unsafe extern "C" fn type_library_set_effectiveness(
-    mut ptr: ExternPointer<TypeLibrary>,
+    mut ptr: ExternPointer<Box<dyn TypeLibrary>>,
     attacking: TypeIdentifier,
     defending: TypeIdentifier,
     effectiveness: f32,
diff --git a/src/lib.rs b/src/lib.rs
index 09d3f7f..1ef6a34 100755
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
 #![allow(clippy::too_many_arguments, clippy::needless_range_loop)]
 #![allow(clippy::not_unsafe_ptr_arg_deref)]
+#![allow(clippy::borrowed_box)]
 #![allow(incomplete_features)]
 #![deny(missing_docs)]
 #![deny(clippy::missing_docs_in_private_items)]
diff --git a/src/script_implementations/wasm/export_registry/dynamic_data/battle.rs b/src/script_implementations/wasm/export_registry/dynamic_data/battle.rs
index 52d8512..a81ef6d 100755
--- a/src/script_implementations/wasm/export_registry/dynamic_data/battle.rs
+++ b/src/script_implementations/wasm/export_registry/dynamic_data/battle.rs
@@ -37,8 +37,8 @@ register! {
     fn battle_get_library(
         env: FunctionEnvMut<WebAssemblyEnv>,
         battle: ExternRef<Battle>,
-    ) -> ExternRef<DynamicLibrary> {
-        ExternRef::func_new(&env, battle.value_func(&env).unwrap().library().as_ref())
+    ) -> ExternRef<dyn DynamicLibrary> {
+        ExternRef::func_new(&env, &battle.value_func_arc(&env).unwrap().library().clone())
     }
 
     fn battle_get_sides(
diff --git a/src/script_implementations/wasm/export_registry/dynamic_data/mod.rs b/src/script_implementations/wasm/export_registry/dynamic_data/mod.rs
index f8fd4a8..2eb5444 100755
--- a/src/script_implementations/wasm/export_registry/dynamic_data/mod.rs
+++ b/src/script_implementations/wasm/export_registry/dynamic_data/mod.rs
@@ -31,9 +31,9 @@ mod turn_choice;
 register! {
     fn dynamic_library_get_static_data(
         env: FunctionEnvMut<WebAssemblyEnv>,
-        dynamic_lib: ExternRef<DynamicLibrary>,
-    ) -> ExternRef<StaticData> {
-        ExternRef::func_new(&env, dynamic_lib.value_func(&env).unwrap().static_data())
+        dynamic_lib: ExternRef<dyn DynamicLibrary>,
+    ) -> ExternRef<dyn StaticData> {
+        ExternRef::func_new(&env, dynamic_lib.value_func_arc(&env).unwrap().static_data())
     }
 
     fn script_get_owner(
diff --git a/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs b/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs
index 79d6294..4379150 100755
--- a/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs
+++ b/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs
@@ -15,9 +15,9 @@ register! {
     fn pokemon_get_library(
         env: FunctionEnvMut<WebAssemblyEnv>,
         pokemon: ExternRef<Pokemon>,
-    ) -> ExternRef<DynamicLibrary> {
-        let lib = pokemon.value_func(&env).unwrap().library().as_ref();
-        ExternRef::func_new(&env, lib)
+    ) -> ExternRef<dyn DynamicLibrary> {
+        let lib = pokemon.value_func(&env).unwrap().library().clone();
+        ExternRef::func_new(&env, &lib)
     }
 
     fn pokemon_get_boosted_stats(
diff --git a/src/script_implementations/wasm/export_registry/static_data/item.rs b/src/script_implementations/wasm/export_registry/static_data/item.rs
index b51f087..67221e3 100755
--- a/src/script_implementations/wasm/export_registry/static_data/item.rs
+++ b/src/script_implementations/wasm/export_registry/static_data/item.rs
@@ -1,7 +1,8 @@
 use crate::script_implementations::wasm::export_registry::register;
 use crate::script_implementations::wasm::extern_ref::ExternRef;
 use crate::script_implementations::wasm::script_resolver::WebAssemblyEnv;
-use crate::static_data::{DataLibrary, Item, ItemLibrary};
+use crate::static_data::Item;
+use crate::static_data::ItemLibrary;
 use crate::StringKey;
 use std::mem::transmute;
 use wasmer::FunctionEnvMut;
@@ -9,23 +10,23 @@ use wasmer::FunctionEnvMut;
 register! {
     fn item_library_get_item(
         env: FunctionEnvMut<WebAssemblyEnv>,
-        lib: ExternRef<ItemLibrary>,
+        lib: ExternRef<dyn ItemLibrary>,
         string_key: ExternRef<StringKey>,
     ) -> ExternRef<dyn Item> {
-        let lib = lib.value_func(&env).unwrap();
+        let lib = lib.value_func_box(&env).unwrap();
         let m = lib.get(string_key.value_func(&env).unwrap());
         if let Some(v) = m {
-            ExternRef::func_new(&env, v)
+            ExternRef::func_new(&env, &v)
         } else {
             ExternRef::null()
         }
     }
 
-    fn item_library_get_item_by_hash(env: FunctionEnvMut<WebAssemblyEnv>, lib: ExternRef<ItemLibrary>, hash: u32) -> ExternRef<dyn Item> {
-        let lib = lib.value_func(&env).unwrap();
+    fn item_library_get_item_by_hash(env: FunctionEnvMut<WebAssemblyEnv>, lib: ExternRef<dyn ItemLibrary>, hash: u32) -> ExternRef<dyn Item> {
+        let lib = lib.value_func_box(&env).unwrap();
         let m = lib.get_by_hash(hash);
         if let Some(v) = m {
-            ExternRef::func_new(&env, v)
+            ExternRef::func_new(&env, &v)
         } else {
             ExternRef::null()
         }
diff --git a/src/script_implementations/wasm/export_registry/static_data/mod.rs b/src/script_implementations/wasm/export_registry/static_data/mod.rs
index d8ca752..ea0e88d 100755
--- a/src/script_implementations/wasm/export_registry/static_data/mod.rs
+++ b/src/script_implementations/wasm/export_registry/static_data/mod.rs
@@ -17,34 +17,34 @@ mod moves;
 mod species;
 
 register! {
-    fn static_data_get_move_library(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<StaticData>) -> ExternRef<MoveLibrary> {
-        ExternRef::func_new(&env, data_library.value_func(&env).unwrap().moves())
+    fn static_data_get_move_library(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<dyn StaticData>) -> ExternRef<dyn MoveLibrary> {
+        ExternRef::func_new(&env, data_library.value_func_box(&env).unwrap().moves())
     }
 
     fn static_data_get_species_library(
         env: FunctionEnvMut<WebAssemblyEnv>,
-        data_library: ExternRef<StaticData>,
-    ) -> ExternRef<SpeciesLibrary> {
-        ExternRef::func_new(&env, data_library.value_func(&env).unwrap().species())
+        data_library: ExternRef<dyn StaticData>,
+    ) -> ExternRef<dyn SpeciesLibrary> {
+        ExternRef::func_new(&env, data_library.value_func_box(&env).unwrap().species())
     }
 
-    fn static_data_get_item_library(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<StaticData>) -> ExternRef<ItemLibrary> {
-        ExternRef::func_new(&env, data_library.value_func(&env).unwrap().items())
+    fn static_data_get_item_library(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<dyn StaticData>) -> ExternRef<dyn ItemLibrary> {
+        ExternRef::func_new(&env, data_library.value_func_box(&env).unwrap().items())
     }
 
-    fn static_data_get_type_library(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<StaticData>) -> ExternRef<TypeLibrary> {
-        ExternRef::func_new(&env, data_library.value_func(&env).unwrap().types())
+    fn static_data_get_type_library(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<dyn StaticData>) -> ExternRef<dyn TypeLibrary> {
+        ExternRef::func_new(&env, data_library.value_func_box(&env).unwrap().types())
     }
 
     fn static_data_get_library_settings(
         env: FunctionEnvMut<WebAssemblyEnv>,
-        data_library: ExternRef<StaticData>,
-    ) -> ExternRef<LibrarySettings> {
-        ExternRef::func_new(&env, data_library.value_func(&env).unwrap().settings())
+        data_library: ExternRef<dyn StaticData>,
+    ) -> ExternRef<dyn LibrarySettings> {
+        ExternRef::func_new(&env, data_library.value_func_box(&env).unwrap().settings())
     }
 
-    fn library_settings_get_maximum_level(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<LibrarySettings>) -> LevelInt {
-        data_library.value_func(&env).unwrap().maximum_level()
+    fn library_settings_get_maximum_level(env: FunctionEnvMut<WebAssemblyEnv>, data_library: ExternRef<dyn LibrarySettings>) -> LevelInt {
+        data_library.value_func_box(&env).unwrap().maximum_level()
     }
 
     fn statistic_set_get(env: FunctionEnvMut<WebAssemblyEnv>, statistics_set: ExternRef<StatisticSet<u32>>, stat: u8) -> i64 {
diff --git a/src/script_implementations/wasm/export_registry/static_data/moves.rs b/src/script_implementations/wasm/export_registry/static_data/moves.rs
index b75a4fb..aaec1cd 100755
--- a/src/script_implementations/wasm/export_registry/static_data/moves.rs
+++ b/src/script_implementations/wasm/export_registry/static_data/moves.rs
@@ -1,30 +1,30 @@
 use crate::script_implementations::wasm::export_registry::register;
 use crate::script_implementations::wasm::extern_ref::ExternRef;
 use crate::script_implementations::wasm::script_resolver::WebAssemblyEnv;
-use crate::static_data::{DataLibrary, MoveData, MoveLibrary};
+use crate::static_data::{MoveData, MoveLibrary};
 use crate::StringKey;
 use wasmer::FunctionEnvMut;
 
 register! {
 fn move_library_get_move(
     env: FunctionEnvMut<WebAssemblyEnv>,
-    lib: ExternRef<MoveLibrary>,
+    lib: ExternRef<dyn MoveLibrary>,
     string_key: ExternRef<StringKey>,
 ) -> ExternRef<dyn MoveData> {
-    let lib = lib.value_func(&env).unwrap();
+    let lib = lib.value_func_box(&env).unwrap();
     let m = lib.get(string_key.value_func(&env).unwrap());
     if let Some(v) = m {
-        ExternRef::func_new(&env, v)
+        ExternRef::func_new(&env, &v)
     } else {
         ExternRef::null()
     }
 }
 
-fn move_library_get_move_by_hash(env: FunctionEnvMut<WebAssemblyEnv>, lib: ExternRef<MoveLibrary>, hash: u32) -> ExternRef<dyn MoveData> {
-    let lib = lib.value_func(&env).unwrap();
+fn move_library_get_move_by_hash(env: FunctionEnvMut<WebAssemblyEnv>, lib: ExternRef<dyn MoveLibrary>, hash: u32) -> ExternRef<dyn MoveData> {
+    let lib = lib.value_func_box(&env).unwrap();
     let m = lib.get_by_hash(hash);
     if let Some(v) = m {
-        ExternRef::func_new(&env, v)
+        ExternRef::func_new(&env, &v)
     } else {
         ExternRef::null()
     }
diff --git a/src/script_implementations/wasm/export_registry/static_data/species.rs b/src/script_implementations/wasm/export_registry/static_data/species.rs
index 02ef3e1..68aea50 100755
--- a/src/script_implementations/wasm/export_registry/static_data/species.rs
+++ b/src/script_implementations/wasm/export_registry/static_data/species.rs
@@ -1,7 +1,8 @@
 use crate::script_implementations::wasm::export_registry::register;
 use crate::script_implementations::wasm::extern_ref::ExternRef;
 use crate::script_implementations::wasm::script_resolver::WebAssemblyEnv;
-use crate::static_data::{DataLibrary, Species, SpeciesLibrary};
+use crate::static_data::Species;
+use crate::static_data::SpeciesLibrary;
 use crate::StringKey;
 use wasmer::FunctionEnvMut;
 
@@ -9,13 +10,13 @@ register! {
 
 fn species_library_get_species(
     env: FunctionEnvMut<WebAssemblyEnv>,
-    lib: ExternRef<SpeciesLibrary>,
+    lib: ExternRef<dyn SpeciesLibrary>,
     string_key: ExternRef<StringKey>,
 ) -> ExternRef<dyn Species> {
-    let lib = lib.value_func(&env).unwrap();
+    let lib = lib.value_func_box(&env).unwrap();
     let m = lib.get(string_key.value_func(&env).unwrap());
     if let Some(v) = m {
-        ExternRef::func_new(&env, v)
+        ExternRef::func_new(&env, &v)
     } else {
         ExternRef::null()
     }
diff --git a/src/script_implementations/wasm/extern_ref.rs b/src/script_implementations/wasm/extern_ref.rs
index 7e0e242..bb3b766 100755
--- a/src/script_implementations/wasm/extern_ref.rs
+++ b/src/script_implementations/wasm/extern_ref.rs
@@ -74,6 +74,15 @@ impl<T: ValueIdentifiable + ?Sized> ExternRef<T> {
         self.value_arc(&env.data().data())
     }
 
+    /// Returns the real value for a given ExternRef. Note that the requested type must be the same as the type of the
+    /// value when it was passed before. If these types do not match, this will panic.
+    pub fn value_func_box(&self, env: &FunctionEnvMut<WebAssemblyEnv>) -> Option<&Box<T>>
+    where
+        T: 'static,
+    {
+        self.value_box(&env.data().data())
+    }
+
     /// Returns the real value for a given ExternRef. Note that the requested type must be the same as the type of the
     /// value when it was passed before. If these types do not match, this will panic.
     pub fn value<'a, 'b, 'c>(&'a self, env: &'b Arc<WebAssemblyEnvironmentData>) -> Option<&'c T>
@@ -93,6 +102,15 @@ impl<T: ValueIdentifiable + ?Sized> ExternRef<T> {
             .downcast_ref::<Arc<T>>()
             .cloned()
     }
+
+    /// Returns the real value for a given ExternRef. Note that the requested type must be the same as the type of the
+    /// value when it was passed before. If these types do not match, this will panic.
+    pub fn value_box(&self, env: &Arc<WebAssemblyEnvironmentData>) -> Option<&Box<T>>
+    where
+        T: 'static,
+    {
+        env.get_extern_ref_value::<T>(self.index).downcast_ref::<Box<T>>()
+    }
 }
 
 unsafe impl<T: ?Sized> FromToNativeWasmType for ExternRef<T> {
diff --git a/src/script_implementations/wasm/script.rs b/src/script_implementations/wasm/script.rs
index 36b800f..1896eb7 100755
--- a/src/script_implementations/wasm/script.rs
+++ b/src/script_implementations/wasm/script.rs
@@ -125,7 +125,7 @@ impl Script for WebAssemblyScript {
         }
     }
 
-    fn on_initialize(&self, library: &DynamicLibrary, pars: Vec<EffectParameter>) {
+    fn on_initialize(&self, library: &Arc<dyn DynamicLibrary>, pars: Vec<EffectParameter>) {
         if !self.has_capability(&WebAssemblyScriptCapabilities::Initialize) {
             return;
         }
diff --git a/src/script_implementations/wasm/script_function_cache.rs b/src/script_implementations/wasm/script_function_cache.rs
index 212bd4a..a2ca70f 100755
--- a/src/script_implementations/wasm/script_function_cache.rs
+++ b/src/script_implementations/wasm/script_function_cache.rs
@@ -117,7 +117,7 @@ unsafe impl<T> FromToNativeWasmType for WasmPtr<T> {
 script_function_cache! {
     stack()
     on_remove()
-    on_initialize(ExternRef<DynamicLibrary>, VecExternRef<EffectParameter>)
+    on_initialize(ExternRef<dyn DynamicLibrary>, VecExternRef<EffectParameter>)
     on_before_turn(ExternRef<TurnChoice>)
     change_speed(ExternRef<TurnChoice>, WasmPtr<u32>)
     change_priority(ExternRef<TurnChoice>, WasmPtr<i8>)
diff --git a/src/static_data/libraries/ability_library.rs b/src/static_data/libraries/ability_library.rs
index d6d244e..3e1fce6 100755
--- a/src/static_data/libraries/ability_library.rs
+++ b/src/static_data/libraries/ability_library.rs
@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 use std::sync::Arc;
 
 use indexmap::IndexMap;
@@ -6,26 +7,31 @@ use crate::static_data::Ability;
 use crate::static_data::DataLibrary;
 use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 
+/// A storage for all abilities that can be used in this data library.
+pub trait AbilityLibrary: DataLibrary<dyn Ability> + ValueIdentifiable + Debug {}
+
 /// A storage for all abilities that can be used in this data library.
 #[derive(Debug)]
-pub struct AbilityLibrary {
+pub struct AbilityLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The underlying map for the library.
     map: IndexMap<StringKey, Arc<dyn Ability>>,
 }
 
-impl AbilityLibrary {
+impl AbilityLibraryImpl {
     /// Instantiates a new ability library.
-    pub fn new(capacity: usize) -> AbilityLibrary {
-        AbilityLibrary {
+    pub fn new(capacity: usize) -> Self {
+        Self {
             identifier: Default::default(),
             map: IndexMap::with_capacity(capacity),
         }
     }
 }
 
-impl DataLibrary<dyn Ability> for AbilityLibrary {
+impl AbilityLibrary for AbilityLibraryImpl {}
+
+impl DataLibrary<dyn Ability> for AbilityLibraryImpl {
     fn map(&self) -> &IndexMap<StringKey, Arc<dyn Ability>> {
         &self.map
     }
@@ -34,7 +40,7 @@ impl DataLibrary<dyn Ability> for AbilityLibrary {
     }
 }
 
-impl ValueIdentifiable for AbilityLibrary {
+impl ValueIdentifiable for AbilityLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -42,14 +48,14 @@ impl ValueIdentifiable for AbilityLibrary {
 
 #[cfg(test)]
 pub mod tests {
+    use crate::static_data::libraries::ability_library::AbilityLibraryImpl;
     use crate::static_data::AbilityImpl;
-    use crate::static_data::AbilityLibrary;
     use crate::static_data::DataLibrary;
     use crate::StringKey;
     use std::sync::Arc;
 
-    pub fn build() -> AbilityLibrary {
-        let mut lib = AbilityLibrary::new(1);
+    pub fn build() -> AbilityLibraryImpl {
+        let mut lib = AbilityLibraryImpl::new(1);
         lib.add(
             &StringKey::new("test_ability"),
             Arc::new(AbilityImpl::new(
diff --git a/src/static_data/libraries/data_library.rs b/src/static_data/libraries/data_library.rs
index b483320..c0441f9 100755
--- a/src/static_data/libraries/data_library.rs
+++ b/src/static_data/libraries/data_library.rs
@@ -24,13 +24,13 @@ pub trait DataLibrary<T: ?Sized> {
     }
 
     /// Gets a value from the library.
-    fn get(&self, key: &StringKey) -> Option<&Arc<T>> {
-        self.map().get::<StringKey>(key)
+    fn get(&self, key: &StringKey) -> Option<Arc<T>> {
+        self.map().get::<StringKey>(key).cloned()
     }
 
     /// Gets a value from the library.
-    fn get_by_hash(&self, key: u32) -> Option<&Arc<T>> {
-        self.map().get::<u32>(&key)
+    fn get_by_hash(&self, key: u32) -> Option<Arc<T>> {
+        self.map().get::<u32>(&key).cloned()
     }
 
     /// Gets a value from the library by the index where it is stored.
diff --git a/src/static_data/libraries/growth_rate_library.rs b/src/static_data/libraries/growth_rate_library.rs
index 4ac29a1..6b5579e 100755
--- a/src/static_data/libraries/growth_rate_library.rs
+++ b/src/static_data/libraries/growth_rate_library.rs
@@ -8,44 +8,56 @@ use crate::static_data::GrowthRate;
 use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 
 /// A library to store all growth rates.
-pub struct GrowthRateLibrary {
+pub trait GrowthRateLibrary: Debug + ValueIdentifiable {
+    /// Calculates the level for a given growth key name and a certain experience.
+    fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt;
+    /// Calculates the experience for a given growth key name and a certain level.
+    fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> u32;
+    /// Adds a new growth rate with a name and value.
+    fn add_growth_rate(&mut self, key: &StringKey, value: Box<dyn GrowthRate>);
+}
+
+/// A library to store all growth rates.
+pub struct GrowthRateLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The underlying data structure.
     growth_rates: HashMap<StringKey, Box<dyn GrowthRate>>,
 }
 
-impl GrowthRateLibrary {
+impl GrowthRateLibraryImpl {
     /// Instantiates a new growth rate library with a capacity.
-    pub fn new(capacity: usize) -> GrowthRateLibrary {
-        GrowthRateLibrary {
+    pub fn new(capacity: usize) -> Self {
+        Self {
             identifier: Default::default(),
             growth_rates: HashMap::with_capacity(capacity),
         }
     }
+}
 
+impl GrowthRateLibrary for GrowthRateLibraryImpl {
     /// Calculates the level for a given growth key name and a certain experience.
-    pub fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt {
+    fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt {
         self.growth_rates[growth_rate].calculate_level(experience)
     }
     /// Calculates the experience for a given growth key name and a certain level.
-    pub fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> u32 {
+    fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> u32 {
         self.growth_rates[growth_rate].calculate_experience(level)
     }
 
     /// Adds a new growth rate with a name and value.
-    pub fn add_growth_rate(&mut self, key: &StringKey, value: Box<dyn GrowthRate>) {
+    fn add_growth_rate(&mut self, key: &StringKey, value: Box<dyn GrowthRate>) {
         self.growth_rates.insert(key.clone(), value);
     }
 }
 
-impl ValueIdentifiable for GrowthRateLibrary {
+impl ValueIdentifiable for GrowthRateLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
 }
 
-impl Debug for GrowthRateLibrary {
+impl Debug for GrowthRateLibraryImpl {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.debug_struct("GrowthRateLibrary").finish()
     }
@@ -53,11 +65,13 @@ impl Debug for GrowthRateLibrary {
 
 #[cfg(test)]
 pub mod tests {
+    use super::*;
     use crate::static_data::growth_rates::LookupGrowthRate;
     use crate::static_data::libraries::growth_rate_library::GrowthRateLibrary;
+    use crate::static_data::GrowthRateLibraryImpl;
 
-    pub fn build() -> GrowthRateLibrary {
-        let mut lib = GrowthRateLibrary::new(1);
+    pub fn build() -> GrowthRateLibraryImpl {
+        let mut lib = GrowthRateLibraryImpl::new(1);
 
         // Borrow as mut so we can insert
         let w = &mut lib;
@@ -70,6 +84,21 @@ pub mod tests {
         lib
     }
 
+    mockall::mock! {
+        #[derive(Debug)]
+        pub GrowthRateLibrary{}
+        impl GrowthRateLibrary for GrowthRateLibrary {
+            fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt;
+            fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> u32;
+            fn add_growth_rate(&mut self, key: &StringKey, value: Box<dyn GrowthRate>);
+        }
+        impl ValueIdentifiable for GrowthRateLibrary {
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+
     #[test]
     fn add_growth_rate_to_library_and_calculate_level() {
         let lib = build();
diff --git a/src/static_data/libraries/item_library.rs b/src/static_data/libraries/item_library.rs
index ee27b47..9053b66 100755
--- a/src/static_data/libraries/item_library.rs
+++ b/src/static_data/libraries/item_library.rs
@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 use std::sync::Arc;
 
 use indexmap::IndexMap;
@@ -7,26 +8,30 @@ use crate::static_data::Item;
 use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 
 /// A library to store all items.
-#[derive(Debug)]
+pub trait ItemLibrary: DataLibrary<dyn Item> + ValueIdentifiable + Debug {}
 
-pub struct ItemLibrary {
+/// A library to store all items.
+#[derive(Debug)]
+pub struct ItemLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The underlying data structure.
     map: IndexMap<StringKey, Arc<dyn Item>>,
 }
 
-impl ItemLibrary {
+impl ItemLibraryImpl {
     /// Instantiates a new Item Library.
-    pub fn new(capacity: usize) -> ItemLibrary {
-        ItemLibrary {
+    pub fn new(capacity: usize) -> Self {
+        Self {
             identifier: Default::default(),
             map: IndexMap::with_capacity(capacity),
         }
     }
 }
 
-impl DataLibrary<dyn Item> for ItemLibrary {
+impl ItemLibrary for ItemLibraryImpl {}
+
+impl DataLibrary<dyn Item> for ItemLibraryImpl {
     fn map(&self) -> &IndexMap<StringKey, Arc<dyn Item>> {
         &self.map
     }
@@ -36,7 +41,7 @@ impl DataLibrary<dyn Item> for ItemLibrary {
     }
 }
 
-impl ValueIdentifiable for ItemLibrary {
+impl ValueIdentifiable for ItemLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -49,8 +54,8 @@ pub mod tests {
 
     use crate::static_data::libraries::data_library::DataLibrary;
     use crate::static_data::libraries::item_library::ItemLibrary;
-    use crate::static_data::ItemImpl;
     use crate::static_data::{BattleItemCategory, ItemCategory};
+    use crate::static_data::{ItemImpl, ItemLibraryImpl};
 
     fn build_item() -> ItemImpl {
         ItemImpl::new(
@@ -62,14 +67,14 @@ pub mod tests {
         )
     }
 
-    pub fn build() -> ItemLibrary {
-        let mut lib = ItemLibrary::new(1);
+    pub fn build() -> Box<dyn ItemLibrary> {
+        let mut lib = ItemLibraryImpl::new(1);
         let m = build_item();
         // Borrow as mut so we can insert
         let w = &mut lib;
         w.add(&"foo".into(), Arc::new(m));
         // Drops borrow as mut
 
-        lib
+        Box::new(lib)
     }
 }
diff --git a/src/static_data/libraries/library_settings.rs b/src/static_data/libraries/library_settings.rs
index 298cabf..5526911 100755
--- a/src/static_data/libraries/library_settings.rs
+++ b/src/static_data/libraries/library_settings.rs
@@ -1,16 +1,23 @@
 use crate::defines::LevelInt;
 use crate::{ValueIdentifiable, ValueIdentifier};
+use std::fmt::Debug;
+
+/// This library holds several misc settings for the library.
+pub trait LibrarySettings: Debug + ValueIdentifiable {
+    /// The highest level a Pokemon can be.
+    fn maximum_level(&self) -> LevelInt;
+}
 
 /// This library holds several misc settings for the library.
 #[derive(Debug)]
-pub struct LibrarySettings {
+pub struct LibrarySettingsImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The highest level a Pokemon can be.
     maximum_level: LevelInt,
 }
 
-impl LibrarySettings {
+impl LibrarySettingsImpl {
     /// Creates a new settings library.
     pub fn new(maximum_level: LevelInt) -> Self {
         Self {
@@ -18,14 +25,16 @@ impl LibrarySettings {
             maximum_level,
         }
     }
+}
 
+impl LibrarySettings for LibrarySettingsImpl {
     /// The highest level a Pokemon can be.
-    pub fn maximum_level(&self) -> LevelInt {
+    fn maximum_level(&self) -> LevelInt {
         self.maximum_level
     }
 }
 
-impl ValueIdentifiable for LibrarySettings {
+impl ValueIdentifiable for LibrarySettingsImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
diff --git a/src/static_data/libraries/mod.rs b/src/static_data/libraries/mod.rs
index 374108c..1504ce4 100755
--- a/src/static_data/libraries/mod.rs
+++ b/src/static_data/libraries/mod.rs
@@ -1,21 +1,21 @@
 #[doc(inline)]
-pub use ability_library::AbilityLibrary;
+pub use ability_library::*;
 #[doc(inline)]
-pub use data_library::DataLibrary;
+pub use data_library::*;
 #[doc(inline)]
-pub use growth_rate_library::GrowthRateLibrary;
+pub use growth_rate_library::*;
 #[doc(inline)]
-pub use item_library::ItemLibrary;
+pub use item_library::*;
 #[doc(inline)]
-pub use library_settings::LibrarySettings;
+pub use library_settings::*;
 #[doc(inline)]
-pub use move_library::MoveLibrary;
+pub use move_library::*;
 #[doc(inline)]
 pub use nature_library::*;
 #[doc(inline)]
-pub use species_library::SpeciesLibrary;
+pub use species_library::*;
 #[doc(inline)]
-pub use static_data::StaticData;
+pub use static_data::*;
 #[doc(inline)]
 pub use type_library::*;
 
@@ -23,22 +23,22 @@ pub use type_library::*;
 pub(crate) mod tests {}
 
 /// The library data for abilities.
-mod ability_library;
+pub(crate) mod ability_library;
 /// Basic helper trait for libraries.
-mod data_library;
+pub(crate) mod data_library;
 /// The library data for groth rates.
-mod growth_rate_library;
+pub(crate) mod growth_rate_library;
 /// The library data for items.
-mod item_library;
+pub(crate) mod item_library;
 /// The library data for misc settings.
-mod library_settings;
+pub(crate) mod library_settings;
 /// The library data for moves.
-mod move_library;
+pub(crate) mod move_library;
 /// The library data for natures.
-mod nature_library;
+pub(crate) mod nature_library;
 /// The library data for species.
-mod species_library;
+pub(crate) mod species_library;
 /// The combination of all libraries.
 pub(crate) mod static_data;
 /// The library data for types.
-mod type_library;
+pub(crate) mod type_library;
diff --git a/src/static_data/libraries/move_library.rs b/src/static_data/libraries/move_library.rs
index 81fa76e..16db077 100755
--- a/src/static_data/libraries/move_library.rs
+++ b/src/static_data/libraries/move_library.rs
@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 use std::sync::Arc;
 
 use indexmap::IndexMap;
@@ -7,26 +8,30 @@ use crate::static_data::MoveData;
 use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 
 /// A library to store all data for moves.
-#[derive(Debug)]
+pub trait MoveLibrary: DataLibrary<dyn MoveData> + ValueIdentifiable + Debug {}
 
-pub struct MoveLibrary {
+/// A library to store all data for moves.
+#[derive(Debug)]
+pub struct MoveLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The underlying map.
     map: IndexMap<StringKey, Arc<dyn MoveData>>,
 }
 
-impl MoveLibrary {
+impl MoveLibraryImpl {
     /// Instantiates a new Move Library.
-    pub fn new(capacity: usize) -> MoveLibrary {
-        MoveLibrary {
+    pub fn new(capacity: usize) -> Self {
+        Self {
             identifier: Default::default(),
             map: IndexMap::with_capacity(capacity),
         }
     }
 }
 
-impl DataLibrary<dyn MoveData> for MoveLibrary {
+impl MoveLibrary for MoveLibraryImpl {}
+
+impl DataLibrary<dyn MoveData> for MoveLibraryImpl {
     fn map(&self) -> &IndexMap<StringKey, Arc<dyn MoveData>> {
         &self.map
     }
@@ -35,7 +40,7 @@ impl DataLibrary<dyn MoveData> for MoveLibrary {
     }
 }
 
-impl ValueIdentifiable for MoveLibrary {
+impl ValueIdentifiable for MoveLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -48,7 +53,7 @@ pub mod tests {
 
     use crate::static_data::libraries::data_library::DataLibrary;
     use crate::static_data::libraries::move_library::MoveLibrary;
-    use crate::static_data::{MoveCategory, MoveDataImpl, MoveTarget};
+    use crate::static_data::{MoveCategory, MoveDataImpl, MoveLibraryImpl, MoveTarget};
     use crate::StringKey;
 
     fn build_move() -> MoveDataImpl {
@@ -66,14 +71,14 @@ pub mod tests {
         )
     }
 
-    pub fn build() -> MoveLibrary {
-        let mut lib = MoveLibrary::new(1);
+    pub fn build() -> Box<dyn MoveLibrary> {
+        let mut lib = MoveLibraryImpl::new(1);
         let m = build_move();
         // Borrow as mut so we can insert
         let w = &mut lib;
         w.add(&StringKey::new("foo"), Arc::new(m));
         // Drops borrow as mut
 
-        lib
+        Box::new(lib)
     }
 }
diff --git a/src/static_data/libraries/nature_library.rs b/src/static_data/libraries/nature_library.rs
index a71ce60..158e65e 100644
--- a/src/static_data/libraries/nature_library.rs
+++ b/src/static_data/libraries/nature_library.rs
@@ -1,38 +1,51 @@
 use crate::static_data::Nature;
 use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 use hashbrown::HashMap;
+use std::fmt::Debug;
 use std::sync::Arc;
 
+/// A library of all natures that can be used, stored by their names.
+pub trait NatureLibrary: Debug + ValueIdentifiable {
+    /// Adds a new nature with name to the library.
+    fn load_nature(&mut self, name: StringKey, nature: Arc<dyn Nature>);
+    /// Gets a nature by name.
+    fn get_nature(&self, key: &StringKey) -> Option<Arc<dyn Nature>>;
+    /// Finds a nature name by nature.
+    fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> StringKey;
+}
+
 /// A library of all natures that can be used, stored by their names.
 #[derive(Debug)]
-pub struct NatureLibrary {
+pub struct NatureLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The underlying data structure.
     map: HashMap<StringKey, Arc<dyn Nature>>,
 }
 
-impl NatureLibrary {
+impl NatureLibraryImpl {
     /// Creates a new nature library with a given capacity.
     pub fn new(capacity: usize) -> Self {
-        NatureLibrary {
+        Self {
             identifier: Default::default(),
             map: HashMap::with_capacity(capacity),
         }
     }
+}
 
+impl NatureLibrary for NatureLibraryImpl {
     /// Adds a new nature with name to the library.
-    pub fn load_nature(&mut self, name: StringKey, nature: Arc<dyn Nature>) {
+    fn load_nature(&mut self, name: StringKey, nature: Arc<dyn Nature>) {
         self.map.insert(name, nature);
     }
 
     /// Gets a nature by name.
-    pub fn get_nature(&self, key: &StringKey) -> Option<&Arc<dyn Nature>> {
-        self.map.get(key)
+    fn get_nature(&self, key: &StringKey) -> Option<Arc<dyn Nature>> {
+        self.map.get(key).cloned()
     }
 
     /// Finds a nature name by nature.
-    pub fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> StringKey {
+    fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> StringKey {
         for kv in &self.map {
             // As natures can't be copied, and should always be the same reference as the value
             // in the map, we just compare by reference.
@@ -44,7 +57,7 @@ impl NatureLibrary {
     }
 }
 
-impl ValueIdentifiable for NatureLibrary {
+impl ValueIdentifiable for NatureLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -52,11 +65,12 @@ impl ValueIdentifiable for NatureLibrary {
 
 #[cfg(test)]
 pub mod tests {
+    use super::*;
     use crate::static_data::statistics::Statistic;
-    use crate::static_data::{NatureImpl, NatureLibrary};
+    use crate::static_data::{NatureImpl, NatureLibrary, NatureLibraryImpl};
 
-    pub fn build() -> NatureLibrary {
-        let mut lib = NatureLibrary::new(2);
+    pub fn build() -> NatureLibraryImpl {
+        let mut lib = NatureLibraryImpl::new(2);
 
         lib.load_nature(
             "test_nature".into(),
@@ -66,9 +80,24 @@ pub mod tests {
         lib
     }
 
+    mockall::mock! {
+        #[derive(Debug)]
+        pub NatureLibrary{}
+        impl NatureLibrary for NatureLibrary {
+            fn load_nature(&mut self, name: StringKey, nature: Arc<dyn Nature>);
+            fn get_nature(&self, key: &StringKey) -> Option<Arc<dyn Nature>>;
+            fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> StringKey;
+        }
+        impl ValueIdentifiable for NatureLibrary {
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+
     #[test]
     fn create_nature_library_insert_and_retrieve() {
-        let mut lib = NatureLibrary::new(2);
+        let mut lib = NatureLibraryImpl::new(2);
         lib.load_nature(
             "foo".into(),
             NatureImpl::new(Statistic::HP, Statistic::Attack, 1.1, 0.9),
@@ -86,7 +115,7 @@ pub mod tests {
 
     #[test]
     fn create_nature_library_insert_and_get_name() {
-        let mut lib = NatureLibrary::new(2);
+        let mut lib = NatureLibraryImpl::new(2);
         lib.load_nature(
             "foo".into(),
             NatureImpl::new(Statistic::HP, Statistic::Attack, 1.1, 0.9),
@@ -97,10 +126,10 @@ pub mod tests {
         );
 
         let n1 = lib.get_nature(&"foo".into()).expect("Nature was not found");
-        let name = lib.get_nature_name(n1);
+        let name = lib.get_nature_name(&n1);
         assert_eq!(name, "foo".into());
         let n2 = lib.get_nature(&"bar".into()).expect("Nature was not found");
-        let name2 = lib.get_nature_name(n2);
+        let name2 = lib.get_nature_name(&n2);
         assert_eq!(name2, "bar".into());
     }
 }
diff --git a/src/static_data/libraries/species_library.rs b/src/static_data/libraries/species_library.rs
index 31a9682..d382210 100755
--- a/src/static_data/libraries/species_library.rs
+++ b/src/static_data/libraries/species_library.rs
@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 use std::sync::Arc;
 
 use indexmap::IndexMap;
@@ -7,26 +8,30 @@ use crate::static_data::Species;
 use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 
 /// A library to store all data for Pokemon species.
-#[derive(Debug)]
+pub trait SpeciesLibrary: DataLibrary<dyn Species> + ValueIdentifiable + Debug {}
 
-pub struct SpeciesLibrary {
+/// A library to store all data for Pokemon species.
+#[derive(Debug)]
+pub struct SpeciesLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The underlying map.
     map: IndexMap<StringKey, Arc<dyn Species>>,
 }
 
-impl SpeciesLibrary {
+impl SpeciesLibraryImpl {
     /// Instantiates a new Species Library.
-    pub fn new(capacity: usize) -> SpeciesLibrary {
-        SpeciesLibrary {
+    pub fn new(capacity: usize) -> Self {
+        Self {
             identifier: Default::default(),
             map: IndexMap::with_capacity(capacity),
         }
     }
 }
 
-impl DataLibrary<dyn Species> for SpeciesLibrary {
+impl SpeciesLibrary for SpeciesLibraryImpl {}
+
+impl DataLibrary<dyn Species> for SpeciesLibraryImpl {
     fn map(&self) -> &IndexMap<StringKey, Arc<dyn Species>> {
         &self.map
     }
@@ -35,7 +40,7 @@ impl DataLibrary<dyn Species> for SpeciesLibrary {
     }
 }
 
-impl ValueIdentifiable for SpeciesLibrary {
+impl ValueIdentifiable for SpeciesLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -43,14 +48,27 @@ impl ValueIdentifiable for SpeciesLibrary {
 
 #[cfg(test)]
 pub mod tests {
+    use super::*;
+    use crate::static_data::{FormImpl, LearnableMovesImpl, SpeciesImpl, StaticStatisticSet};
     use hashbrown::HashSet;
     use std::sync::Arc;
 
-    use crate::static_data::libraries::data_library::DataLibrary;
-    use crate::static_data::libraries::species_library::SpeciesLibrary;
-    use crate::static_data::LearnableMovesImpl;
-    use crate::static_data::{FormImpl, StaticStatisticSet};
-    use crate::static_data::{Species, SpeciesImpl};
+    mockall::mock! {
+        #[derive(Debug)]
+        pub SpeciesLibrary{}
+        impl SpeciesLibrary for SpeciesLibrary {}
+        impl DataLibrary<dyn Species> for SpeciesLibrary {
+            fn get<'a, 'b>(&'a self, key: &'b StringKey) -> Option<Arc<dyn Species>> ;
+            fn get_by_hash<'a>(&'a self, key: u32) -> Option<Arc<dyn Species>>;
+            fn map(&self) -> &IndexMap<StringKey, Arc<dyn Species>>;
+            fn get_modify(&mut self) -> &mut IndexMap<StringKey, Arc<dyn Species>>;
+        }
+        impl ValueIdentifiable for SpeciesLibrary {
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
+        }
+    }
 
     fn build_species() -> Arc<dyn Species> {
         Arc::new(SpeciesImpl::new(
@@ -75,15 +93,15 @@ pub mod tests {
         ))
     }
 
-    pub fn build() -> SpeciesLibrary {
-        let mut lib = SpeciesLibrary::new(1);
+    pub fn build() -> Box<dyn SpeciesLibrary> {
+        let mut lib = SpeciesLibraryImpl::new(1);
         let species = build_species();
         // Borrow as mut so we can insert
         let w = &mut lib;
         w.add(&"foo".into(), species);
         // Drops borrow as mut
 
-        lib
+        Box::new(lib)
     }
 
     #[test]
@@ -94,8 +112,9 @@ pub mod tests {
         let r = &lib;
         let mon = r.get(&"foo".into());
         assert!(mon.is_some());
-        assert_eq!(mon.unwrap().id(), 0_u16);
-        assert_eq!(mon.unwrap().as_ref().name(), &"foo".into());
+        let mon = mon.unwrap();
+        assert_eq!(mon.id(), 0_u16);
+        assert_eq!(mon.name(), &"foo".into());
         assert_eq!(r.len(), 1);
     }
 
diff --git a/src/static_data/libraries/static_data.rs b/src/static_data/libraries/static_data.rs
index 115e98d..1d7886d 100755
--- a/src/static_data/libraries/static_data.rs
+++ b/src/static_data/libraries/static_data.rs
@@ -1,115 +1,154 @@
-use crate::static_data::AbilityLibrary;
-use crate::static_data::GrowthRateLibrary;
-use crate::static_data::ItemLibrary;
-use crate::static_data::LibrarySettings;
 use crate::static_data::MoveLibrary;
 use crate::static_data::NatureLibrary;
 use crate::static_data::SpeciesLibrary;
 use crate::static_data::TypeLibrary;
+use crate::static_data::{AbilityLibrary, AbilityLibraryImpl, ItemLibraryImpl, MoveLibraryImpl, SpeciesLibraryImpl};
+use crate::static_data::{GrowthRateLibrary, GrowthRateLibraryImpl};
+use crate::static_data::{ItemLibrary, NatureLibraryImpl};
+use crate::static_data::{LibrarySettings, TypeLibraryImpl};
 use crate::{ValueIdentifiable, ValueIdentifier};
+use std::fmt::Debug;
+
+/// The storage for all different libraries.
+pub trait StaticData: Debug + ValueIdentifiable {
+    /// Several misc settings for the library.
+    fn settings(&self) -> &Box<dyn LibrarySettings>;
+    /// All data for Pokemon species.
+    fn species(&self) -> &Box<dyn SpeciesLibrary>;
+    /// All data for Pokemon species.
+    fn species_mut(&mut self) -> &mut Box<dyn SpeciesLibrary>;
+    /// All data for the moves.
+    fn moves(&self) -> &Box<dyn MoveLibrary>;
+    /// All data for the moves.
+    fn moves_mut(&mut self) -> &mut Box<dyn MoveLibrary>;
+    /// All data for the items.
+    fn items(&self) -> &Box<dyn ItemLibrary>;
+    /// All data for the items.
+    fn items_mut(&mut self) -> &mut Box<dyn ItemLibrary>;
+
+    /// All data for growth rates.
+    fn growth_rates(&self) -> &Box<dyn GrowthRateLibrary>;
+    /// All data for growth rates.
+    fn growth_rates_mut(&mut self) -> &mut Box<dyn GrowthRateLibrary>;
+    /// All data related to types and type effectiveness.
+    fn types(&self) -> &Box<dyn TypeLibrary>;
+    /// All data related to types and type effectiveness.
+    fn types_mut(&mut self) -> &mut Box<dyn TypeLibrary>;
+    /// All data related to natures.
+    fn natures(&self) -> &Box<dyn NatureLibrary>;
+    /// All data related to natures.
+    fn natures_mut(&mut self) -> &mut Box<dyn NatureLibrary>;
+    /// All data related to abilities.
+    fn abilities(&self) -> &Box<dyn AbilityLibrary>;
+    /// All data related to abilities.
+    fn abilities_mut(&mut self) -> &mut Box<dyn AbilityLibrary>;
+}
 
 /// The storage for all different libraries.
 #[derive(Debug)]
-pub struct StaticData {
+pub struct StaticDataImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// Several misc settings for the library.
-    settings: LibrarySettings,
+    settings: Box<dyn LibrarySettings>,
     /// All data for Pokemon species.
-    species: SpeciesLibrary,
+    species: Box<dyn SpeciesLibrary>,
     /// All data for the moves.
-    moves: MoveLibrary,
+    moves: Box<dyn MoveLibrary>,
     /// All data for the items.
-    items: ItemLibrary,
+    items: Box<dyn ItemLibrary>,
     /// All data for growth rates.
-    growth_rates: GrowthRateLibrary,
+    growth_rates: Box<dyn GrowthRateLibrary>,
     /// All data related to types and type effectiveness.
-    types: TypeLibrary,
+    types: Box<dyn TypeLibrary>,
     /// All data related to natures.
-    natures: NatureLibrary,
+    natures: Box<dyn NatureLibrary>,
     /// All data related to abilities.
-    abilities: AbilityLibrary,
+    abilities: Box<dyn AbilityLibrary>,
 }
 
-impl StaticData {
+impl StaticDataImpl {
     /// Instantiates a new data collection.
-    pub fn new(settings: LibrarySettings) -> Self {
+    pub fn new(settings: Box<dyn LibrarySettings>) -> Self {
         Self {
             identifier: Default::default(),
             settings,
-            species: SpeciesLibrary::new(0),
-            moves: MoveLibrary::new(0),
-            items: ItemLibrary::new(0),
-            growth_rates: GrowthRateLibrary::new(0),
-            types: TypeLibrary::new(0),
-            natures: NatureLibrary::new(0),
-            abilities: AbilityLibrary::new(0),
+            species: Box::new(SpeciesLibraryImpl::new(0)),
+            moves: Box::new(MoveLibraryImpl::new(0)),
+            items: Box::new(ItemLibraryImpl::new(0)),
+            growth_rates: Box::new(GrowthRateLibraryImpl::new(0)),
+            types: Box::new(TypeLibraryImpl::new(0)),
+            natures: Box::new(NatureLibraryImpl::new(0)),
+            abilities: Box::new(AbilityLibraryImpl::new(0)),
         }
     }
+}
+
+impl StaticData for StaticDataImpl {
     /// Several misc settings for the library.
-    pub fn settings(&self) -> &LibrarySettings {
+    fn settings(&self) -> &Box<dyn LibrarySettings> {
         &self.settings
     }
     /// All data for Pokemon species.
-    pub fn species(&self) -> &SpeciesLibrary {
+    fn species(&self) -> &Box<dyn SpeciesLibrary> {
         &self.species
     }
     /// All data for Pokemon species.
-    pub fn species_mut(&mut self) -> &mut SpeciesLibrary {
+    fn species_mut(&mut self) -> &mut Box<dyn SpeciesLibrary> {
         &mut self.species
     }
     /// All data for the moves.
-    pub fn moves(&self) -> &MoveLibrary {
+    fn moves(&self) -> &Box<dyn MoveLibrary> {
         &self.moves
     }
     /// All data for the moves.
-    pub fn moves_mut(&mut self) -> &mut MoveLibrary {
+    fn moves_mut(&mut self) -> &mut Box<dyn MoveLibrary> {
         &mut self.moves
     }
     /// All data for the items.
-    pub fn items(&self) -> &ItemLibrary {
+    fn items(&self) -> &Box<dyn ItemLibrary> {
         &self.items
     }
     /// All data for the items.
-    pub fn items_mut(&mut self) -> &mut ItemLibrary {
+    fn items_mut(&mut self) -> &mut Box<dyn ItemLibrary> {
         &mut self.items
     }
 
     /// All data for growth rates.
-    pub fn growth_rates(&self) -> &GrowthRateLibrary {
+    fn growth_rates(&self) -> &Box<dyn GrowthRateLibrary> {
         &self.growth_rates
     }
     /// All data for growth rates.
-    pub fn growth_rates_mut(&mut self) -> &mut GrowthRateLibrary {
+    fn growth_rates_mut(&mut self) -> &mut Box<dyn GrowthRateLibrary> {
         &mut self.growth_rates
     }
     /// All data related to types and type effectiveness.
-    pub fn types(&self) -> &TypeLibrary {
+    fn types(&self) -> &Box<dyn TypeLibrary> {
         &self.types
     }
     /// All data related to types and type effectiveness.
-    pub fn types_mut(&mut self) -> &mut TypeLibrary {
+    fn types_mut(&mut self) -> &mut Box<dyn TypeLibrary> {
         &mut self.types
     }
     /// All data related to natures.
-    pub fn natures(&self) -> &NatureLibrary {
+    fn natures(&self) -> &Box<dyn NatureLibrary> {
         &self.natures
     }
     /// All data related to natures.
-    pub fn natures_mut(&mut self) -> &mut NatureLibrary {
+    fn natures_mut(&mut self) -> &mut Box<dyn NatureLibrary> {
         &mut self.natures
     }
     /// All data related to abilities.
-    pub fn abilities(&self) -> &AbilityLibrary {
+    fn abilities(&self) -> &Box<dyn AbilityLibrary> {
         &self.abilities
     }
     /// All data related to abilities.
-    pub fn abilities_mut(&mut self) -> &mut AbilityLibrary {
+    fn abilities_mut(&mut self) -> &mut Box<dyn AbilityLibrary> {
         &mut self.abilities
     }
 }
 
-impl ValueIdentifiable for StaticData {
+impl ValueIdentifiable for StaticDataImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -117,23 +156,48 @@ impl ValueIdentifiable for StaticData {
 
 #[cfg(test)]
 pub mod test {
-    use crate::static_data::libraries::library_settings::LibrarySettings;
-    use crate::static_data::libraries::static_data::StaticData;
-    use crate::static_data::libraries::{
-        ability_library, growth_rate_library, item_library, move_library, nature_library, species_library, type_library,
-    };
+    use super::*;
+    use crate::static_data::LibrarySettingsImpl;
 
-    pub fn build() -> StaticData {
-        StaticData {
+    mockall::mock! {
+        #[derive(Debug)]
+        pub StaticData{}
+        impl StaticData for StaticData {
+            fn settings(&self) -> &Box<dyn LibrarySettings>;
+            fn species(&self) -> &Box<dyn SpeciesLibrary>;
+            fn species_mut(&mut self) -> &mut Box<dyn SpeciesLibrary>;
+            fn moves(&self) -> &Box<dyn MoveLibrary>;
+            fn moves_mut(&mut self) -> &mut Box<dyn MoveLibrary>;
+            fn items(&self) -> &Box<dyn ItemLibrary>;
+            fn items_mut(&mut self) -> &mut Box<dyn ItemLibrary>;
+
+            fn growth_rates(&self) -> & Box<dyn GrowthRateLibrary>;
+            fn growth_rates_mut(&mut self) -> &mut Box<dyn GrowthRateLibrary>;
+            fn types(&self) -> &Box<dyn TypeLibrary>;
+            fn types_mut(&mut self) -> &mut Box<dyn TypeLibrary>;
+            fn natures(&self) -> &Box<dyn NatureLibrary>;
+            fn natures_mut(&mut self) -> &mut Box<dyn NatureLibrary>;
+            fn abilities(&self) -> &Box<dyn AbilityLibrary>;
+            fn abilities_mut(&mut self) -> &mut Box<dyn AbilityLibrary>;
+        }
+        impl ValueIdentifiable for StaticData {
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+
+    pub fn build() -> StaticDataImpl {
+        StaticDataImpl {
             identifier: Default::default(),
-            settings: LibrarySettings::new(100),
-            species: species_library::tests::build(),
-            moves: move_library::tests::build(),
-            items: item_library::tests::build(),
-            growth_rates: growth_rate_library::tests::build(),
-            types: type_library::tests::build(),
-            natures: nature_library::tests::build(),
-            abilities: ability_library::tests::build(),
+            settings: Box::new(LibrarySettingsImpl::new(100)),
+            species: crate::static_data::libraries::species_library::tests::build(),
+            moves: crate::static_data::libraries::move_library::tests::build(),
+            items: crate::static_data::libraries::item_library::tests::build(),
+            growth_rates: Box::new(crate::static_data::libraries::growth_rate_library::tests::build()),
+            types: Box::new(crate::static_data::libraries::type_library::tests::build()),
+            natures: Box::new(crate::static_data::libraries::nature_library::tests::build()),
+            abilities: Box::new(crate::static_data::libraries::ability_library::tests::build()),
         }
     }
 }
diff --git a/src/static_data/libraries/type_library.rs b/src/static_data/libraries/type_library.rs
index 5b52016..cc97ed3 100755
--- a/src/static_data/libraries/type_library.rs
+++ b/src/static_data/libraries/type_library.rs
@@ -1,5 +1,6 @@
 use atomig::Atom;
 use hashbrown::HashMap;
+use std::fmt::Debug;
 
 use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 
@@ -24,9 +25,32 @@ impl From<TypeIdentifier> for u8 {
     }
 }
 
+/// All data related to types and effectiveness.
+pub trait TypeLibrary: Debug + ValueIdentifiable {
+    /// Gets the type identifier for a type with a name.
+    fn get_type_id(&self, key: &StringKey) -> Option<TypeIdentifier>;
+
+    /// Gets the type name from the type identifier.
+    fn get_type_name(&self, t: TypeIdentifier) -> Option<StringKey>;
+
+    /// Gets the effectiveness for a single attacking type against a single defending type.
+    fn get_single_effectiveness(&self, attacking: TypeIdentifier, defending: TypeIdentifier) -> f32;
+
+    /// Gets the effectiveness for a single attacking type against an amount of defending types.
+    /// This is equivalent to running [`get_single_effectiveness`] on each defending type, and
+    /// multiplying the results with each other.
+    fn get_effectiveness(&self, attacking: TypeIdentifier, defending: &[TypeIdentifier]) -> f32;
+
+    /// Registers a new type in the library.
+    fn register_type(&mut self, name: &StringKey) -> TypeIdentifier;
+
+    /// Sets the effectiveness for an attacking type against a defending type.
+    fn set_effectiveness(&mut self, attacking: TypeIdentifier, defending: TypeIdentifier, effectiveness: f32);
+}
+
 /// All data related to types and effectiveness.
 #[derive(Debug)]
-pub struct TypeLibrary {
+pub struct TypeLibraryImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// A list of types
@@ -35,23 +59,25 @@ pub struct TypeLibrary {
     effectiveness: Vec<Vec<f32>>,
 }
 
-impl TypeLibrary {
+impl TypeLibraryImpl {
     /// Instantiates a new type library with a specific capacity.
-    pub fn new(capacity: usize) -> TypeLibrary {
-        TypeLibrary {
+    pub fn new(capacity: usize) -> Self {
+        Self {
             identifier: Default::default(),
             types: HashMap::with_capacity(capacity),
             effectiveness: vec![],
         }
     }
+}
 
+impl TypeLibrary for TypeLibraryImpl {
     /// Gets the type identifier for a type with a name.
-    pub fn get_type_id(&self, key: &StringKey) -> Option<TypeIdentifier> {
+    fn get_type_id(&self, key: &StringKey) -> Option<TypeIdentifier> {
         self.types.get(key).cloned()
     }
 
     /// Gets the type name from the type identifier.
-    pub fn get_type_name(&self, t: TypeIdentifier) -> Option<StringKey> {
+    fn get_type_name(&self, t: TypeIdentifier) -> Option<StringKey> {
         for kv in &self.types {
             if *kv.1 == t {
                 return Some(kv.0.clone());
@@ -61,14 +87,14 @@ impl TypeLibrary {
     }
 
     /// Gets the effectiveness for a single attacking type against a single defending type.
-    pub fn get_single_effectiveness(&self, attacking: TypeIdentifier, defending: TypeIdentifier) -> f32 {
+    fn get_single_effectiveness(&self, attacking: TypeIdentifier, defending: TypeIdentifier) -> f32 {
         self.effectiveness[(attacking.val - 1) as usize][(defending.val - 1) as usize]
     }
 
     /// Gets the effectiveness for a single attacking type against an amount of defending types.
     /// This is equivalent to running [`get_single_effectiveness`] on each defending type, and
     /// multiplying the results with each other.
-    pub fn get_effectiveness(&self, attacking: TypeIdentifier, defending: &[TypeIdentifier]) -> f32 {
+    fn get_effectiveness(&self, attacking: TypeIdentifier, defending: &[TypeIdentifier]) -> f32 {
         let mut e = 1.0;
         for def in defending {
             e *= self.get_single_effectiveness(attacking, *def);
@@ -77,7 +103,7 @@ impl TypeLibrary {
     }
 
     /// Registers a new type in the library.
-    pub fn register_type(&mut self, name: &StringKey) -> TypeIdentifier {
+    fn register_type(&mut self, name: &StringKey) -> TypeIdentifier {
         let id = TypeIdentifier {
             val: (self.types.len() + 1) as u8,
         };
@@ -90,12 +116,12 @@ impl TypeLibrary {
     }
 
     /// Sets the effectiveness for an attacking type against a defending type.
-    pub fn set_effectiveness(&mut self, attacking: TypeIdentifier, defending: TypeIdentifier, effectiveness: f32) {
+    fn set_effectiveness(&mut self, attacking: TypeIdentifier, defending: TypeIdentifier, effectiveness: f32) {
         self.effectiveness[(attacking.val - 1) as usize][(defending.val - 1) as usize] = effectiveness;
     }
 }
 
-impl ValueIdentifiable for TypeLibrary {
+impl ValueIdentifiable for TypeLibraryImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
@@ -105,10 +131,11 @@ impl ValueIdentifiable for TypeLibrary {
 pub mod tests {
     use assert_approx_eq::assert_approx_eq;
 
+    use super::*;
     use crate::static_data::libraries::type_library::TypeLibrary;
 
-    pub fn build() -> TypeLibrary {
-        let mut lib = TypeLibrary::new(2);
+    pub fn build() -> TypeLibraryImpl {
+        let mut lib = TypeLibraryImpl::new(2);
 
         // Borrow as mut so we can insert
         let w = &mut lib;
@@ -124,7 +151,7 @@ pub mod tests {
 
     #[test]
     fn add_two_types_retrieve_them() {
-        let mut lib = TypeLibrary::new(2);
+        let mut lib = TypeLibraryImpl::new(2);
 
         // Borrow as mut so we can insert
         let w = &mut lib;
@@ -140,7 +167,7 @@ pub mod tests {
 
     #[test]
     fn add_two_types_set_effectiveness_retrieve() {
-        let mut lib = TypeLibrary::new(2);
+        let mut lib = TypeLibraryImpl::new(2);
 
         // Borrow as mut so we can insert
         let w = &mut lib;
@@ -158,7 +185,7 @@ pub mod tests {
 
     #[test]
     fn add_two_types_get_aggregate_effectiveness() {
-        let mut lib = TypeLibrary::new(2);
+        let mut lib = TypeLibraryImpl::new(2);
 
         // Borrow as mut so we can insert
         let w = &mut lib;
@@ -176,7 +203,7 @@ pub mod tests {
 
     #[test]
     fn add_two_types_get_type_name() {
-        let mut lib = TypeLibrary::new(2);
+        let mut lib = TypeLibraryImpl::new(2);
 
         // Borrow as mut so we can insert
         let w = &mut lib;
diff --git a/src/static_data/species_data/form.rs b/src/static_data/species_data/form.rs
index 8dd3239..53b8b5a 100755
--- a/src/static_data/species_data/form.rs
+++ b/src/static_data/species_data/form.rs
@@ -28,7 +28,6 @@ pub trait Form: ValueIdentifiable + Debug {
     /// The possible hidden abilities a Pokemon with this form can have.
     fn hidden_abilities(&self) -> &Vec<StringKey>;
 
-    #[allow(clippy::borrowed_box)]
     /// The moves a Pokemon with this form can learn.
     fn moves(&self) -> &Box<dyn LearnableMoves>;
     /// Arbitrary flags can be set on a form for scripting use.
@@ -146,7 +145,6 @@ impl Form for FormImpl {
         &self.hidden_abilities
     }
 
-    #[allow(clippy::borrowed_box)]
     /// The moves a Pokemon with this form can learn.
     fn moves(&self) -> &Box<dyn LearnableMoves> {
         &self.moves
@@ -233,7 +231,6 @@ pub(crate) mod tests {
             fn base_stats(&self) -> &StaticStatisticSet<u16>;
             fn abilities(&self) -> &Vec<StringKey>;
             fn hidden_abilities(&self) -> &Vec<StringKey>;
-            #[allow(clippy::borrowed_box)]
             fn moves(&self) -> &Box<dyn LearnableMoves>;
             fn flags(&self) -> &HashSet<StringKey>;
             fn get_type(&self, index: usize) -> TypeIdentifier;
diff --git a/tests/common/library_loader.rs b/tests/common/library_loader.rs
index b6419a3..6c341e1 100755
--- a/tests/common/library_loader.rs
+++ b/tests/common/library_loader.rs
@@ -10,24 +10,24 @@ use project_root::get_project_root;
 use serde_json::Value;
 
 use pkmn_lib::defines::LevelInt;
-use pkmn_lib::dynamic_data::DynamicLibrary;
 use pkmn_lib::dynamic_data::Gen7BattleStatCalculator;
 use pkmn_lib::dynamic_data::Gen7DamageLibrary;
 use pkmn_lib::dynamic_data::Gen7MiscLibrary;
+use pkmn_lib::dynamic_data::{DynamicLibrary, DynamicLibraryImpl};
 use pkmn_lib::script_implementations::wasm::script_resolver::WebAssemblyScriptResolver;
 use pkmn_lib::static_data::{
-    AbilityImpl, AbilityLibrary, BattleItemCategory, DataLibrary, EffectParameter, Form, FormImpl, GrowthRateLibrary,
-    ItemImpl, ItemLibrary, LearnableMoves, LearnableMovesImpl, LibrarySettings, LookupGrowthRate, MoveDataImpl,
-    MoveLibrary, NatureImpl, NatureLibrary, SecondaryEffect, SecondaryEffectImpl, SpeciesImpl, StaticData,
-    StaticStatisticSet, Statistic, TypeLibrary,
+    AbilityImpl, AbilityLibrary, BattleItemCategory, EffectParameter, Form, FormImpl, GrowthRateLibrary, ItemImpl,
+    ItemLibrary, LearnableMoves, LearnableMovesImpl, LibrarySettingsImpl, LookupGrowthRate, MoveDataImpl, MoveLibrary,
+    NatureImpl, NatureLibrary, SecondaryEffect, SecondaryEffectImpl, SpeciesImpl, StaticData, StaticDataImpl,
+    StaticStatisticSet, Statistic, TypeLibrary, TypeLibraryImpl,
 };
 use pkmn_lib::StringKey;
 
-pub fn load_library() -> DynamicLibrary {
+pub fn load_library() -> Arc<dyn DynamicLibrary> {
     let mut path = get_project_root().unwrap();
     path.push("tests/data/");
     let path = path.to_str().unwrap().to_string();
-    let mut data = StaticData::new(LibrarySettings::new(100));
+    let mut data = StaticDataImpl::new(Box::new(LibrarySettingsImpl::new(100)));
     load_types(&path, data.types_mut());
     load_natures(&path, data.natures_mut());
     load_items(&path, data.items_mut());
@@ -38,16 +38,16 @@ pub fn load_library() -> DynamicLibrary {
     let mut resolver = WebAssemblyScriptResolver::new();
     load_wasm(&path, resolver.as_mut());
 
-    DynamicLibrary::new(
-        data,
+    Arc::new(DynamicLibraryImpl::new(
+        Box::new(data),
         Box::new(Gen7BattleStatCalculator::new()),
         Box::new(Gen7DamageLibrary::new(false)),
         Box::new(Gen7MiscLibrary::new()),
         resolver,
-    )
+    ))
 }
 
-pub fn load_types(path: &String, type_library: &mut TypeLibrary) {
+pub fn load_types(path: &String, type_library: &mut Box<dyn TypeLibrary>) {
     let mut reader = csv::ReaderBuilder::new()
         .delimiter(b'|')
         .from_path(path.to_string() + "Types.csv")
@@ -69,7 +69,7 @@ pub fn load_types(path: &String, type_library: &mut TypeLibrary) {
     }
 }
 
-pub fn load_natures(path: &String, nature_library: &mut NatureLibrary) {
+pub fn load_natures(path: &String, nature_library: &mut Box<dyn NatureLibrary>) {
     let mut reader = csv::ReaderBuilder::new()
         .delimiter(b'|')
         .from_path(path.to_string() + "Natures.csv")
@@ -93,7 +93,7 @@ pub fn load_natures(path: &String, nature_library: &mut NatureLibrary) {
     }
 }
 
-pub fn load_items(path: &String, lib: &mut ItemLibrary) {
+pub fn load_items(path: &String, lib: &mut Box<dyn ItemLibrary>) {
     let mut file = File::open(path.to_string() + "Items.json").unwrap();
     let mut data = String::new();
     file.read_to_string(&mut data).unwrap();
@@ -123,7 +123,7 @@ pub fn load_items(path: &String, lib: &mut ItemLibrary) {
     }
 }
 
-pub fn load_growth_rates(path: &String, growth_rate_library: &mut GrowthRateLibrary) {
+pub fn load_growth_rates(path: &String, growth_rate_library: &mut Box<dyn GrowthRateLibrary>) {
     let mut file = File::open(path.to_string() + "GrowthRates.json").unwrap();
     let mut data = String::new();
     file.read_to_string(&mut data).unwrap();
@@ -142,7 +142,7 @@ pub fn load_growth_rates(path: &String, growth_rate_library: &mut GrowthRateLibr
     }
 }
 
-pub fn load_abilities(path: &String, ability_library: &mut AbilityLibrary) {
+pub fn load_abilities(path: &String, ability_library: &mut Box<dyn AbilityLibrary>) {
     let mut file = File::open(path.to_string() + "Abilities.json").unwrap();
     let mut data = String::new();
     file.read_to_string(&mut data).unwrap();
@@ -166,7 +166,7 @@ pub fn load_abilities(path: &String, ability_library: &mut AbilityLibrary) {
     }
 }
 
-pub fn load_moves(path: &String, lib: &mut StaticData) {
+pub fn load_moves(path: &String, lib: &mut dyn StaticData) {
     let mut file = File::open(path.to_string() + "Moves.json").unwrap();
     let mut data = String::new();
     file.read_to_string(&mut data).unwrap();
@@ -231,7 +231,7 @@ pub fn load_moves(path: &String, lib: &mut StaticData) {
     }
 }
 
-pub fn load_species(path: &String, library: &mut StaticData) {
+pub fn load_species(path: &String, library: &mut dyn StaticData) {
     let mut file = File::open(path.to_string() + "Pokemon.json").unwrap();
     let mut data = String::new();
     file.read_to_string(&mut data).unwrap();
@@ -285,7 +285,7 @@ fn load_wasm(path: &String, library: &mut WebAssemblyScriptResolver) {
     library.finalize();
 }
 
-fn parse_form(name: StringKey, value: &Value, library: &mut StaticData) -> Arc<dyn Form> {
+fn parse_form(name: StringKey, value: &Value, library: &mut dyn StaticData) -> Arc<dyn Form> {
     let mut abilities = Vec::new();
     for a in value.get("abilities").unwrap().as_array().unwrap() {
         abilities.push(a.as_str().unwrap().into());
@@ -308,7 +308,7 @@ fn parse_form(name: StringKey, value: &Value, library: &mut StaticData) -> Arc<d
         .map(|a| library.types().get_type_id(&a.as_str().unwrap().into()).unwrap())
         .collect();
 
-    let moves = parse_moves(value.get("moves").unwrap(), library.moves());
+    let moves = parse_moves(value.get("moves").unwrap(), library.moves_mut());
 
     Arc::new(FormImpl::new(
         &name,
@@ -368,7 +368,7 @@ where
     )
 }
 
-fn parse_moves(value: &Value, move_library: &MoveLibrary) -> Box<dyn LearnableMoves> {
+fn parse_moves(value: &Value, move_library: &mut Box<dyn MoveLibrary>) -> Box<dyn LearnableMoves> {
     let mut moves = LearnableMovesImpl::default();
 
     let level_moves = value.get("levelMoves").unwrap().as_array().unwrap();
@@ -410,7 +410,7 @@ fn parse_effect_parameter(value: &Value) -> EffectParameter {
 fn test_type_library_loaded() {
     let mut path = get_project_root().unwrap();
     path.push("tests/data/");
-    let mut lib = TypeLibrary::new(18);
+    let mut lib: Box<dyn TypeLibrary> = Box::new(TypeLibraryImpl::new(18));
     load_types(&path.to_str().unwrap().to_string(), &mut lib);
 
     assert_eq!(
diff --git a/tests/common/test_case.rs b/tests/common/test_case.rs
index 030afa1..01ca3de 100755
--- a/tests/common/test_case.rs
+++ b/tests/common/test_case.rs
@@ -43,7 +43,7 @@ struct TestPokemon {
 }
 
 impl TestCase {
-    pub fn run_test(&self, library: Arc<DynamicLibrary>) {
+    pub fn run_test(&self, library: Arc<dyn DynamicLibrary>) {
         let mut parties = Vec::new();
         for party in &self.battle_setup.parties {
             let pokemon = party
@@ -73,7 +73,7 @@ impl TestCase {
 }
 
 impl TestPokemon {
-    fn to_pokemon(&self, library: Arc<DynamicLibrary>) -> Pokemon {
+    fn to_pokemon(&self, library: Arc<dyn DynamicLibrary>) -> Pokemon {
         let mut builder = PokemonBuilder::new(library, self.species.as_str().into(), self.level);
         for move_name in &self.moves {
             builder = builder.learn_move(StringKey::new(move_name));
diff --git a/tests/main.rs b/tests/main.rs
index 12e0939..477ebd2 100755
--- a/tests/main.rs
+++ b/tests/main.rs
@@ -17,8 +17,8 @@ use crate::common::{library_loader, TestCase};
 
 pub mod common;
 
-fn get_library() -> Arc<DynamicLibrary> {
-    Arc::new(library_loader::load_library())
+fn get_library() -> Arc<dyn DynamicLibrary> {
+    library_loader::load_library()
 }
 
 #[test]