diff --git a/src/dynamic_data/flow/choice_queue.rs b/src/dynamic_data/flow/choice_queue.rs
index 16d3724..67e2700 100755
--- a/src/dynamic_data/flow/choice_queue.rs
+++ b/src/dynamic_data/flow/choice_queue.rs
@@ -160,6 +160,7 @@ impl ValueIdentifiable for ChoiceQueue {
 
 #[cfg(test)]
 #[allow(clippy::unwrap_used)]
+#[allow(clippy::indexing_slicing)]
 mod tests {
     use super::*;
     use crate::defines::LevelInt;
diff --git a/src/dynamic_data/flow/turn_runner.rs b/src/dynamic_data/flow/turn_runner.rs
index ae1c4ee..010f503 100755
--- a/src/dynamic_data/flow/turn_runner.rs
+++ b/src/dynamic_data/flow/turn_runner.rs
@@ -213,7 +213,7 @@ impl Battle {
                 .library()
                 .static_data()
                 .types()
-                .get_effectiveness(hit_type, &target.types());
+                .get_effectiveness(hit_type, &target.types())?;
             script_hook!(
                 change_effectiveness,
                 executing_move,
diff --git a/src/dynamic_data/libraries/battle_stat_calculator.rs b/src/dynamic_data/libraries/battle_stat_calculator.rs
index af1f227..9990078 100755
--- a/src/dynamic_data/libraries/battle_stat_calculator.rs
+++ b/src/dynamic_data/libraries/battle_stat_calculator.rs
@@ -147,6 +147,7 @@ impl ValueIdentifiable for Gen7BattleStatCalculator {
     }
 }
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
 pub mod tests {
     use super::*;
 
diff --git a/src/dynamic_data/libraries/dynamic_library.rs b/src/dynamic_data/libraries/dynamic_library.rs
index 9762e9b..828b0f0 100755
--- a/src/dynamic_data/libraries/dynamic_library.rs
+++ b/src/dynamic_data/libraries/dynamic_library.rs
@@ -127,6 +127,7 @@ impl ValueIdentifiable for DynamicLibraryImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
 pub mod test {
     use super::*;
     use crate::dynamic_data::libraries::battle_stat_calculator::Gen7BattleStatCalculator;
diff --git a/src/dynamic_data/models/learned_move.rs b/src/dynamic_data/models/learned_move.rs
index 01513dc..0c6e844 100755
--- a/src/dynamic_data/models/learned_move.rs
+++ b/src/dynamic_data/models/learned_move.rs
@@ -101,6 +101,7 @@ impl ValueIdentifiable for LearnedMove {
 }
 
 #[cfg(test)]
+#[allow(clippy::unwrap_used)]
 mod tests {
     use super::*;
     use crate::static_data::tests::MockMoveData;
diff --git a/src/dynamic_data/models/pokemon.rs b/src/dynamic_data/models/pokemon.rs
index 3133259..6fb7eea 100755
--- a/src/dynamic_data/models/pokemon.rs
+++ b/src/dynamic_data/models/pokemon.rs
@@ -421,7 +421,7 @@ impl Pokemon {
         }
 
         let form = self.form();
-        let ability = form.get_ability(self.ability_index);
+        let ability = form.get_ability(self.ability_index)?;
         Ok(self
             .library
             .static_data()
diff --git a/src/dynamic_data/models/pokemon_builder.rs b/src/dynamic_data/models/pokemon_builder.rs
index e4e09ea..f43ddb4 100755
--- a/src/dynamic_data/models/pokemon_builder.rs
+++ b/src/dynamic_data/models/pokemon_builder.rs
@@ -53,7 +53,7 @@ impl PokemonBuilder {
             .species()
             .get(&self.species)
             .ok_or(PkmnError::InvalidSpeciesName { species: self.species })?;
-        let form = species.get_default_form();
+        let form = species.get_default_form()?;
         let p = Pokemon::new(
             self.library,
             species,
diff --git a/src/dynamic_data/script_handling/script.rs b/src/dynamic_data/script_handling/script.rs
index 33f6ab9..df296e1 100755
--- a/src/dynamic_data/script_handling/script.rs
+++ b/src/dynamic_data/script_handling/script.rs
@@ -388,6 +388,8 @@ impl Clone for ScriptContainer {
 }
 
 #[cfg(test)]
+#[allow(clippy::unwrap_used)]
+#[allow(clippy::indexing_slicing)]
 mod tests {
     use std::sync::atomic::{AtomicBool, AtomicPtr};
 
diff --git a/src/ffi/static_data/learnable_moves.rs b/src/ffi/static_data/learnable_moves.rs
index 881bf7b..57ac9ac 100644
--- a/src/ffi/static_data/learnable_moves.rs
+++ b/src/ffi/static_data/learnable_moves.rs
@@ -1,5 +1,5 @@
 use crate::defines::LevelInt;
-use crate::ffi::{BorrowedPtr, ExternPointer, OwnedPtr};
+use crate::ffi::{BorrowedPtr, ExternPointer, NativeResult, OwnedPtr};
 use crate::static_data::{LearnableMoves, LearnableMovesImpl};
 use std::ffi::{c_char, CStr};
 use std::ptr::drop_in_place;
@@ -22,6 +22,8 @@ unsafe extern "C" fn learnable_moves_add_level_move(
     mut ptr: ExternPointer<Box<dyn LearnableMoves>>,
     level: LevelInt,
     move_name: BorrowedPtr<c_char>,
-) {
-    ptr.as_mut().add_level_move(level, &CStr::from_ptr(move_name).into())
+) -> NativeResult<()> {
+    ptr.as_mut()
+        .add_level_move(level, &CStr::from_ptr(move_name).into())
+        .into()
 }
diff --git a/src/ffi/static_data/libraries/growth_rate_library.rs b/src/ffi/static_data/libraries/growth_rate_library.rs
index 155f948..020ed0d 100644
--- a/src/ffi/static_data/libraries/growth_rate_library.rs
+++ b/src/ffi/static_data/libraries/growth_rate_library.rs
@@ -23,9 +23,10 @@ unsafe extern "C" fn growth_rate_library_calculate_level(
     ptr: ExternPointer<Box<dyn GrowthRateLibrary>>,
     growth_rate: BorrowedPtr<c_char>,
     experience: u32,
-) -> LevelInt {
+) -> NativeResult<LevelInt> {
     ptr.as_ref()
         .calculate_level(&CStr::from_ptr(growth_rate).into(), experience)
+        .into()
 }
 
 /// Calculates the experience for a given growth key name and a certain level.
diff --git a/src/ffi/static_data/libraries/nature_library.rs b/src/ffi/static_data/libraries/nature_library.rs
index 1c25a99..47f0a78 100644
--- a/src/ffi/static_data/libraries/nature_library.rs
+++ b/src/ffi/static_data/libraries/nature_library.rs
@@ -54,9 +54,12 @@ unsafe extern "C" fn nature_library_get_nature(
 unsafe extern "C" fn nature_library_get_random_nature(
     ptr: ExternPointer<Box<dyn NatureLibrary>>,
     seed: u64,
-) -> IdentifiablePointer<Arc<dyn Nature>> {
+) -> NativeResult<IdentifiablePointer<Arc<dyn Nature>>> {
     let mut rand = Random::new(seed as u128);
-    ptr.as_ref().get_random_nature(&mut rand).into()
+    match ptr.as_ref().get_random_nature(&mut rand) {
+        Ok(nature) => NativeResult::ok(nature.into()),
+        Err(e) => NativeResult::err(e),
+    }
 }
 
 /// Finds a nature name by nature.
@@ -68,9 +71,12 @@ unsafe extern "C" fn nature_library_get_nature_name(
     match nature.as_ref() {
         Some(nature) => {
             let name = ptr.as_ref().get_nature_name(nature);
-            match CString::new(name.str()) {
-                Ok(cstr) => NativeResult::ok(cstr.into_raw()),
-                Err(_) => NativeResult::err(anyhow!("Failed to convert nature name to C string")),
+            match name {
+                Ok(name) => match CString::new(name.str()) {
+                    Ok(cstr) => NativeResult::ok(cstr.into_raw()),
+                    Err(_) => NativeResult::err(anyhow!("Failed to convert nature name to C string")),
+                },
+                Err(e) => NativeResult::err(e),
             }
         }
         None => NativeResult::err(PkmnError::NullReference.into()),
diff --git a/src/ffi/static_data/libraries/type_library.rs b/src/ffi/static_data/libraries/type_library.rs
index bf83a7e..c023864 100644
--- a/src/ffi/static_data/libraries/type_library.rs
+++ b/src/ffi/static_data/libraries/type_library.rs
@@ -58,8 +58,8 @@ extern "C" fn type_library_get_single_effectiveness(
     ptr: ExternPointer<Box<dyn TypeLibrary>>,
     attacking: TypeIdentifier,
     defending: TypeIdentifier,
-) -> f32 {
-    ptr.as_ref().get_single_effectiveness(attacking, defending)
+) -> NativeResult<f32> {
+    ptr.as_ref().get_single_effectiveness(attacking, defending).into()
 }
 
 /// Gets the effectiveness for a single attacking type against an amount of defending types.
@@ -71,9 +71,9 @@ unsafe extern "C" fn type_library_get_effectiveness(
     attacking: TypeIdentifier,
     defending: OwnedPtr<TypeIdentifier>,
     defending_length: usize,
-) -> f32 {
+) -> NativeResult<f32> {
     let v = std::slice::from_raw_parts(defending, defending_length);
-    ptr.as_ref().get_effectiveness(attacking, v)
+    ptr.as_ref().get_effectiveness(attacking, v).into()
 }
 
 /// Registers a new type in the library.
@@ -92,6 +92,8 @@ unsafe extern "C" fn type_library_set_effectiveness(
     attacking: TypeIdentifier,
     defending: TypeIdentifier,
     effectiveness: f32,
-) {
-    ptr.as_mut().set_effectiveness(attacking, defending, effectiveness);
+) -> NativeResult<()> {
+    ptr.as_mut()
+        .set_effectiveness(attacking, defending, effectiveness)
+        .into()
 }
diff --git a/src/lib.rs b/src/lib.rs
index 63cc987..2038c75 100755
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,12 +8,12 @@
 #![deny(clippy::missing_docs_in_private_items)]
 // Linter rules to prevent panics
 // Currently still a WIP to fix all of these
-// #![deny(clippy::unwrap_used)]
-// #![deny(clippy::expect_used)]
-// #![deny(clippy::indexing_slicing)]
-// #![deny(clippy::string_slice)]
-// #![deny(clippy::exit)]
-// #![deny(clippy::panic)]
+#![deny(clippy::unwrap_used)]
+#![deny(clippy::expect_used)]
+#![deny(clippy::indexing_slicing)]
+#![deny(clippy::string_slice)]
+#![deny(clippy::exit)]
+#![deny(clippy::panic)]
 // Features
 #![feature(test)]
 #![feature(const_option)]
@@ -58,6 +58,7 @@ pub mod static_data;
 /// The utils module includes misc utils that are used within PkmnLib
 pub mod utils;
 
+use crate::static_data::TypeIdentifier;
 use thiserror::Error;
 
 /// The PkmnError enum is the error type for PkmnLib. It is used to return common errors from functions
@@ -103,6 +104,12 @@ pub enum PkmnError {
         /// The species that was requested
         species: StringKey,
     },
+    /// Unable to get type
+    #[error("Unable to get type {type_id}")]
+    InvalidTypeIdentifier {
+        /// The type that was requested
+        type_id: TypeIdentifier,
+    },
     /// The given pointer is not a valid CString
     #[error("The given pointer is not a valid CString")]
     InvalidCString,
diff --git a/src/script_implementations/wasm/export_registry/static_data/types.rs b/src/script_implementations/wasm/export_registry/static_data/types.rs
index 81ac68f..7e0cc9d 100644
--- a/src/script_implementations/wasm/export_registry/static_data/types.rs
+++ b/src/script_implementations/wasm/export_registry/static_data/types.rs
@@ -29,7 +29,7 @@ register! {
         defending: u8
     ) -> f32 {
         let lib = lib.value_func_arc(&env).unwrap();
-        lib.get_single_effectiveness(attacking.into(), defending.into())
+        lib.get_single_effectiveness(attacking.into(), defending.into()).unwrap()
     }
 
 }
diff --git a/src/static_data/growth_rates.rs b/src/static_data/growth_rates.rs
index c24d8c9..ffa242e 100755
--- a/src/static_data/growth_rates.rs
+++ b/src/static_data/growth_rates.rs
@@ -49,6 +49,7 @@ impl GrowthRate for LookupGrowthRate {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
 pub(crate) mod tests {
     use super::*;
 
diff --git a/src/static_data/items.rs b/src/static_data/items.rs
index b900b83..b7698ba 100755
--- a/src/static_data/items.rs
+++ b/src/static_data/items.rs
@@ -135,6 +135,7 @@ impl ValueIdentifiable for ItemImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
 pub(crate) mod tests {
     use super::*;
 
diff --git a/src/static_data/libraries/ability_library.rs b/src/static_data/libraries/ability_library.rs
index 3e1fce6..3f5a01f 100755
--- a/src/static_data/libraries/ability_library.rs
+++ b/src/static_data/libraries/ability_library.rs
@@ -47,6 +47,8 @@ impl ValueIdentifiable for AbilityLibraryImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub mod tests {
     use crate::static_data::libraries::ability_library::AbilityLibraryImpl;
     use crate::static_data::AbilityImpl;
diff --git a/src/static_data/libraries/growth_rate_library.rs b/src/static_data/libraries/growth_rate_library.rs
index 3e7f810..e002911 100755
--- a/src/static_data/libraries/growth_rate_library.rs
+++ b/src/static_data/libraries/growth_rate_library.rs
@@ -11,7 +11,7 @@ use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
 /// A library to store all growth rates.
 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;
+    fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> Result<LevelInt>;
     /// Calculates the experience for a given growth key name and a certain level.
     fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> Result<u32>;
     /// Adds a new growth rate with a name and value.
@@ -38,12 +38,19 @@ impl GrowthRateLibraryImpl {
 
 impl GrowthRateLibrary for GrowthRateLibraryImpl {
     /// Calculates the level for a given growth key name and a certain experience.
-    fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt {
-        self.growth_rates[growth_rate].calculate_level(experience)
+    fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> Result<LevelInt> {
+        Ok(self
+            .growth_rates
+            .get(growth_rate)
+            .ok_or_else(|| anyhow::anyhow!("No growth rate found with key {}", growth_rate.to_string()))?
+            .calculate_level(experience))
     }
     /// Calculates the experience for a given growth key name and a certain level.
     fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> Result<u32> {
-        self.growth_rates[growth_rate].calculate_experience(level)
+        self.growth_rates
+            .get(growth_rate)
+            .ok_or_else(|| anyhow::anyhow!("No growth rate found with key {}", growth_rate.to_string()))?
+            .calculate_experience(level)
     }
 
     /// Adds a new growth rate with a name and value.
@@ -65,6 +72,8 @@ impl Debug for GrowthRateLibraryImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::unwrap_used)]
+#[allow(clippy::indexing_slicing)]
 pub mod tests {
     use super::*;
     use crate::static_data::growth_rates::LookupGrowthRate;
@@ -89,7 +98,7 @@ pub mod tests {
         #[derive(Debug)]
         pub GrowthRateLibrary{}
         impl GrowthRateLibrary for GrowthRateLibrary {
-            fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt;
+            fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> Result<LevelInt>;
             fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> Result<u32>;
             fn add_growth_rate(&mut self, key: &StringKey, value: Box<dyn GrowthRate>);
         }
@@ -103,8 +112,8 @@ pub mod tests {
     #[test]
     fn add_growth_rate_to_library_and_calculate_level() {
         let lib = build();
-        assert_eq!(lib.calculate_level(&"test_growthrate".into(), 3), 1);
-        assert_eq!(lib.calculate_level(&"test_growthrate".into(), 50), 3);
+        assert_eq!(lib.calculate_level(&"test_growthrate".into(), 3).unwrap(), 1);
+        assert_eq!(lib.calculate_level(&"test_growthrate".into(), 50).unwrap(), 3);
     }
 
     #[test]
diff --git a/src/static_data/libraries/nature_library.rs b/src/static_data/libraries/nature_library.rs
index 9701547..8268b63 100644
--- a/src/static_data/libraries/nature_library.rs
+++ b/src/static_data/libraries/nature_library.rs
@@ -1,5 +1,7 @@
 use crate::static_data::Nature;
 use crate::{Random, StringKey, ValueIdentifiable, ValueIdentifier};
+use anyhow::bail;
+use anyhow_ext::{ensure, Result};
 use indexmap::IndexMap;
 use std::fmt::Debug;
 use std::sync::Arc;
@@ -11,9 +13,9 @@ pub trait NatureLibrary: Debug + ValueIdentifiable {
     /// Gets a nature by name.
     fn get_nature(&self, key: &StringKey) -> Option<Arc<dyn Nature>>;
     /// Gets a random nature.
-    fn get_random_nature(&self, rand: &mut Random) -> Arc<dyn Nature>;
+    fn get_random_nature(&self, rand: &mut Random) -> Result<Arc<dyn Nature>>;
     /// Finds a nature name by nature.
-    fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> StringKey;
+    fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> Result<StringKey>;
 }
 
 /// A library of all natures that can be used, stored by their names.
@@ -46,21 +48,28 @@ impl NatureLibrary for NatureLibraryImpl {
         self.map.get(key).cloned()
     }
 
-    fn get_random_nature(&self, rand: &mut Random) -> Arc<dyn Nature> {
+    fn get_random_nature(&self, rand: &mut Random) -> Result<Arc<dyn Nature>> {
+        ensure!(!self.map.is_empty(), "No natures were loaded into the library.");
         let i = rand.get_between(0, self.map.len() as i32);
-        return self.map.get_index(i as usize).unwrap().1.clone();
+        Ok(self
+            .map
+            .get_index(i as usize)
+            // this should never happen, but we'll check anyway.
+            .ok_or(anyhow_ext::anyhow!("Failed to get a random nature from the library."))?
+            .1
+            .clone())
     }
 
     /// Finds a nature name by nature.
-    fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> StringKey {
+    fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> Result<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.
             if kv.1.value_identifier() == nature.value_identifier() {
-                return kv.0.clone();
+                return Ok(kv.0.clone());
             }
         }
-        panic!("No name was found for the given nature. This should never happen.");
+        bail!("No name was found for the given nature. The nature may not be in the library.");
     }
 }
 
@@ -71,6 +80,9 @@ impl ValueIdentifiable for NatureLibraryImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
+#[allow(clippy::expect_used)]
 pub mod tests {
     use super::*;
     use crate::static_data::statistics::Statistic;
@@ -93,8 +105,8 @@ pub mod tests {
         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;
-            fn get_random_nature(&self, rand: &mut Random) -> Arc<dyn Nature>;
+            fn get_nature_name(&self, nature: &Arc<dyn Nature>) -> Result<StringKey>;
+            fn get_random_nature(&self, rand: &mut Random) -> Result<Arc<dyn Nature>>;
         }
         impl ValueIdentifiable for NatureLibrary {
             fn value_identifier(&self) -> ValueIdentifier{
@@ -134,10 +146,10 @@ 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).unwrap();
         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).unwrap();
         assert_eq!(name2, "bar".into());
     }
 
@@ -148,7 +160,7 @@ pub mod tests {
             "foo".into(),
             NatureImpl::new(Statistic::HP, Statistic::Attack, 1.1, 0.9),
         );
-        let n1 = lib.get_random_nature(&mut Random::new(0));
+        let n1 = lib.get_random_nature(&mut Random::new(0)).unwrap();
         assert_eq!(n1.increased_stat(), Statistic::HP);
         assert_eq!(n1.decreased_stat(), Statistic::Attack);
         assert_eq!(n1.get_stat_modifier(n1.increased_stat()), 1.1);
diff --git a/src/static_data/libraries/species_library.rs b/src/static_data/libraries/species_library.rs
index 7ec367d..c050bd6 100755
--- a/src/static_data/libraries/species_library.rs
+++ b/src/static_data/libraries/species_library.rs
@@ -47,6 +47,8 @@ impl ValueIdentifiable for SpeciesLibraryImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub mod tests {
     use super::*;
     use crate::static_data::{FormImpl, LearnableMovesImpl, SpeciesImpl, StaticStatisticSet};
diff --git a/src/static_data/libraries/static_data.rs b/src/static_data/libraries/static_data.rs
index b1aa2af..d83a829 100755
--- a/src/static_data/libraries/static_data.rs
+++ b/src/static_data/libraries/static_data.rs
@@ -164,6 +164,8 @@ impl ValueIdentifiable for StaticDataImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub mod test {
     use super::*;
     use crate::static_data::LibrarySettingsImpl;
diff --git a/src/static_data/libraries/type_library.rs b/src/static_data/libraries/type_library.rs
index cc97ed3..8bd2ab3 100755
--- a/src/static_data/libraries/type_library.rs
+++ b/src/static_data/libraries/type_library.rs
@@ -1,8 +1,9 @@
+use anyhow_ext::Result;
 use atomig::Atom;
 use hashbrown::HashMap;
-use std::fmt::Debug;
+use std::fmt::{Debug, Display};
 
-use crate::{StringKey, ValueIdentifiable, ValueIdentifier};
+use crate::{PkmnError, StringKey, ValueIdentifiable, ValueIdentifier};
 
 /// A unique key that can be used to store a reference to a type. Opaque reference to a byte
 /// internally.
@@ -25,6 +26,12 @@ impl From<TypeIdentifier> for u8 {
     }
 }
 
+impl Display for TypeIdentifier {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "TypeId({})", self.val)
+    }
+}
+
 /// All data related to types and effectiveness.
 pub trait TypeLibrary: Debug + ValueIdentifiable {
     /// Gets the type identifier for a type with a name.
@@ -34,18 +41,23 @@ pub trait TypeLibrary: Debug + ValueIdentifiable {
     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;
+    fn get_single_effectiveness(&self, attacking: TypeIdentifier, defending: TypeIdentifier) -> Result<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;
+    fn get_effectiveness(&self, attacking: TypeIdentifier, defending: &[TypeIdentifier]) -> Result<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);
+    fn set_effectiveness(
+        &mut self,
+        attacking: TypeIdentifier,
+        defending: TypeIdentifier,
+        effectiveness: f32,
+    ) -> Result<()>;
 }
 
 /// All data related to types and effectiveness.
@@ -87,19 +99,24 @@ impl TypeLibrary for TypeLibraryImpl {
     }
 
     /// Gets the effectiveness for a single attacking type against a single defending type.
-    fn get_single_effectiveness(&self, attacking: TypeIdentifier, defending: TypeIdentifier) -> f32 {
-        self.effectiveness[(attacking.val - 1) as usize][(defending.val - 1) as usize]
+    fn get_single_effectiveness(&self, attacking: TypeIdentifier, defending: TypeIdentifier) -> Result<f32> {
+        Ok(*self
+            .effectiveness
+            .get((attacking.val - 1) as usize)
+            .ok_or(PkmnError::InvalidTypeIdentifier { type_id: attacking })?
+            .get((defending.val - 1) as usize)
+            .ok_or(PkmnError::InvalidTypeIdentifier { type_id: defending })?)
     }
 
     /// 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 {
+    fn get_effectiveness(&self, attacking: TypeIdentifier, defending: &[TypeIdentifier]) -> Result<f32> {
         let mut e = 1.0;
         for def in defending {
-            e *= self.get_single_effectiveness(attacking, *def);
+            e *= self.get_single_effectiveness(attacking, *def)?;
         }
-        e
+        Ok(e)
     }
 
     /// Registers a new type in the library.
@@ -116,8 +133,19 @@ impl TypeLibrary for TypeLibraryImpl {
     }
 
     /// Sets the effectiveness for an attacking type against a defending type.
-    fn set_effectiveness(&mut self, attacking: TypeIdentifier, defending: TypeIdentifier, effectiveness: f32) {
-        self.effectiveness[(attacking.val - 1) as usize][(defending.val - 1) as usize] = effectiveness;
+    fn set_effectiveness(
+        &mut self,
+        attacking: TypeIdentifier,
+        defending: TypeIdentifier,
+        effectiveness: f32,
+    ) -> Result<()> {
+        *self
+            .effectiveness
+            .get_mut((attacking.val - 1) as usize)
+            .ok_or(PkmnError::InvalidTypeIdentifier { type_id: attacking })?
+            .get_mut((defending.val - 1) as usize)
+            .ok_or(PkmnError::InvalidTypeIdentifier { type_id: defending })? = effectiveness;
+        Ok(())
     }
 }
 
@@ -128,6 +156,8 @@ impl ValueIdentifiable for TypeLibraryImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub mod tests {
     use assert_approx_eq::assert_approx_eq;
 
@@ -143,8 +173,8 @@ pub mod tests {
         let t1 = w.register_type(&"bar".into());
         // Drops borrow as mut
 
-        w.set_effectiveness(t0, t1, 0.5);
-        w.set_effectiveness(t1, t0, 2.0);
+        w.set_effectiveness(t0, t1, 0.5).unwrap();
+        w.set_effectiveness(t1, t0, 2.0).unwrap();
 
         lib
     }
@@ -173,14 +203,14 @@ pub mod tests {
         let w = &mut lib;
         let t0 = w.register_type(&"foo".into());
         let t1 = w.register_type(&"bar".into());
-        w.set_effectiveness(t0, t1, 0.5);
-        w.set_effectiveness(t1, t0, 2.0);
+        w.set_effectiveness(t0, t1, 0.5).unwrap();
+        w.set_effectiveness(t1, t0, 2.0).unwrap();
         // Drops borrow as mut
 
         // Borrow as read so we can read
         let r = &lib;
-        assert_approx_eq!(r.get_single_effectiveness(t0, t1), 0.5);
-        assert_approx_eq!(r.get_single_effectiveness(t1, t0), 2.0);
+        assert_approx_eq!(r.get_single_effectiveness(t0, t1).unwrap(), 0.5);
+        assert_approx_eq!(r.get_single_effectiveness(t1, t0).unwrap(), 2.0);
     }
 
     #[test]
@@ -191,14 +221,14 @@ pub mod tests {
         let w = &mut lib;
         let t0 = w.register_type(&"foo".into());
         let t1 = w.register_type(&"bar".into());
-        w.set_effectiveness(t0, t1, 0.5);
-        w.set_effectiveness(t1, t0, 2.0);
+        w.set_effectiveness(t0, t1, 0.5).unwrap();
+        w.set_effectiveness(t1, t0, 2.0).unwrap();
         // Drops borrow as mut
 
         // Borrow as read so we can read
         let r = &lib;
-        assert_approx_eq!(r.get_effectiveness(t0, &[t1, t1]), 0.25);
-        assert_approx_eq!(r.get_effectiveness(t1, &[t0, t0]), 4.0);
+        assert_approx_eq!(r.get_effectiveness(t0, &[t1, t1]).unwrap(), 0.25);
+        assert_approx_eq!(r.get_effectiveness(t1, &[t0, t0]).unwrap(), 4.0);
     }
 
     #[test]
diff --git a/src/static_data/moves/move_data.rs b/src/static_data/moves/move_data.rs
index 6aba0d5..448a380 100755
--- a/src/static_data/moves/move_data.rs
+++ b/src/static_data/moves/move_data.rs
@@ -208,6 +208,8 @@ impl ValueIdentifiable for MoveDataImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub(crate) mod tests {
     use super::*;
 
diff --git a/src/static_data/moves/secondary_effect.rs b/src/static_data/moves/secondary_effect.rs
index c3f0add..a1bd59c 100755
--- a/src/static_data/moves/secondary_effect.rs
+++ b/src/static_data/moves/secondary_effect.rs
@@ -59,6 +59,8 @@ impl ValueIdentifiable for SecondaryEffectImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub(crate) mod tests {
     use super::*;
     use assert_approx_eq::assert_approx_eq;
diff --git a/src/static_data/natures.rs b/src/static_data/natures.rs
index d8382c8..7b273df 100755
--- a/src/static_data/natures.rs
+++ b/src/static_data/natures.rs
@@ -96,6 +96,8 @@ impl ValueIdentifiable for NatureImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub(crate) mod tests {
     use super::*;
 
diff --git a/src/static_data/species_data/ability.rs b/src/static_data/species_data/ability.rs
index 2251b4a..61e31db 100755
--- a/src/static_data/species_data/ability.rs
+++ b/src/static_data/species_data/ability.rs
@@ -70,6 +70,8 @@ pub struct AbilityIndex {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub(crate) mod tests {
     use super::*;
 
diff --git a/src/static_data/species_data/form.rs b/src/static_data/species_data/form.rs
index cb5df3a..71fbe8b 100755
--- a/src/static_data/species_data/form.rs
+++ b/src/static_data/species_data/form.rs
@@ -1,3 +1,4 @@
+use anyhow_ext::{ensure, Result};
 use hashbrown::HashSet;
 use std::fmt::Debug;
 
@@ -5,8 +6,8 @@ use crate::static_data::Statistic;
 use crate::static_data::TypeIdentifier;
 use crate::static_data::{Ability, StaticStatisticSet};
 use crate::static_data::{AbilityIndex, LearnableMoves};
-use crate::StringKey;
 use crate::{Random, ValueIdentifiable, ValueIdentifier};
+use crate::{StringKey, VecExt};
 
 /// A form is a variant of a specific species. A species always has at least one form, but can have
 /// many more.
@@ -34,7 +35,7 @@ pub trait Form: ValueIdentifiable + Debug {
     fn flags(&self) -> &HashSet<StringKey>;
 
     /// Get a type of the move at a certain index.
-    fn get_type(&self, index: usize) -> TypeIdentifier;
+    fn get_type(&self, index: usize) -> Result<TypeIdentifier>;
 
     /// Gets a single base stat value.
     fn get_base_stat(&self, stat: Statistic) -> u16;
@@ -42,12 +43,12 @@ pub trait Form: ValueIdentifiable + Debug {
     fn find_ability_index(&self, ability: &dyn Ability) -> Option<AbilityIndex>;
 
     /// Gets an ability from the form.
-    fn get_ability(&self, index: AbilityIndex) -> &StringKey;
+    fn get_ability(&self, index: AbilityIndex) -> Result<&StringKey>;
 
     /// Gets a random ability from the form.
-    fn get_random_ability(&self, rand: &mut Random) -> &StringKey;
+    fn get_random_ability(&self, rand: &mut Random) -> Result<&StringKey>;
     /// Gets a random hidden ability from the form.
-    fn get_random_hidden_ability(&self, rand: &mut Random) -> &StringKey;
+    fn get_random_hidden_ability(&self, rand: &mut Random) -> Result<&StringKey>;
 
     /// Check if the form has a specific flag set.
     fn has_flag(&self, key: &StringKey) -> bool;
@@ -158,8 +159,8 @@ impl Form for FormImpl {
     }
 
     /// Get a type of the move at a certain index.
-    fn get_type(&self, index: usize) -> TypeIdentifier {
-        self.types[index]
+    fn get_type(&self, index: usize) -> Result<TypeIdentifier> {
+        Ok(*self.types.get_res(index)?)
     }
 
     /// Gets a single base stat value.
@@ -189,21 +190,25 @@ impl Form for FormImpl {
     }
 
     /// Gets an ability from the form.
-    fn get_ability(&self, index: AbilityIndex) -> &StringKey {
+    fn get_ability(&self, index: AbilityIndex) -> Result<&StringKey> {
         if index.hidden {
-            &self.hidden_abilities[index.index as usize]
+            Ok(self.hidden_abilities.get_res(index.index as usize)?)
         } else {
-            &self.abilities[index.index as usize]
+            Ok(self.abilities.get_res(index.index as usize)?)
         }
     }
 
     /// Gets a random ability from the form.
-    fn get_random_ability(&self, rand: &mut Random) -> &StringKey {
-        &self.abilities[rand.get_between_unsigned(0, self.abilities.len() as u32) as usize]
+    fn get_random_ability(&self, rand: &mut Random) -> Result<&StringKey> {
+        ensure!(!self.abilities.is_empty(), "No abilities on form");
+        self.abilities
+            .get_res(rand.get_between_unsigned(0, self.abilities.len() as u32) as usize)
     }
     /// Gets a random hidden ability from the form.
-    fn get_random_hidden_ability(&self, rand: &mut Random) -> &StringKey {
-        &self.hidden_abilities[rand.get_between_unsigned(0, self.hidden_abilities.len() as u32) as usize]
+    fn get_random_hidden_ability(&self, rand: &mut Random) -> Result<&StringKey> {
+        ensure!(!self.hidden_abilities.is_empty(), "No hidden abilities on form");
+        self.hidden_abilities
+            .get_res(rand.get_between_unsigned(0, self.hidden_abilities.len() as u32) as usize)
     }
 
     /// Check if the form has a specific flag set.
@@ -223,6 +228,8 @@ impl ValueIdentifiable for FormImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub(crate) mod tests {
     use super::*;
 
@@ -240,12 +247,12 @@ pub(crate) mod tests {
             fn hidden_abilities(&self) -> &Vec<StringKey>;
             fn moves(&self) -> &Box<dyn LearnableMoves>;
             fn flags(&self) -> &HashSet<StringKey>;
-            fn get_type(&self, index: usize) -> TypeIdentifier;
+            fn get_type(&self, index: usize) -> Result<TypeIdentifier>;
             fn get_base_stat(&self, stat: Statistic) -> u16;
             fn find_ability_index(&self, ability: &dyn Ability) -> Option<AbilityIndex>;
-            fn get_ability(&self, index: AbilityIndex) -> &StringKey;
-            fn get_random_ability(&self, rand: &mut Random) -> &StringKey;
-            fn get_random_hidden_ability(&self, rand: &mut Random) -> &StringKey;
+            fn get_ability<'a>(&'a self, index: AbilityIndex) -> Result<&'a StringKey>;
+            fn get_random_ability<'a>(&'a self, rand: &mut Random) -> Result<&'a StringKey>;
+            fn get_random_hidden_ability<'a>(&'a self, rand: &mut Random) -> Result<&'a StringKey>;
             fn has_flag(&self, key: &StringKey) -> bool;
             fn has_flag_by_hash(&self, key_hash: u32) -> bool;
         }
diff --git a/src/static_data/species_data/learnable_moves.rs b/src/static_data/species_data/learnable_moves.rs
index b4ee6c0..63e05e2 100755
--- a/src/static_data/species_data/learnable_moves.rs
+++ b/src/static_data/species_data/learnable_moves.rs
@@ -1,13 +1,14 @@
+use anyhow_ext::Result;
 use indexmap::IndexSet;
 use std::fmt::Debug;
 
 use crate::defines::LevelInt;
-use crate::StringKey;
+use crate::{StringKey, VecExt};
 
 /// The storage of the moves a Pokemon can learn.
 pub trait LearnableMoves: Debug {
     /// Adds a new level move the Pokemon can learn.
-    fn add_level_move(&mut self, level: LevelInt, m: &StringKey);
+    fn add_level_move(&mut self, level: LevelInt, m: &StringKey) -> Result<()>;
     /// Gets all moves a Pokemon can learn when leveling up to a specific level.
     fn get_learned_by_level(&self, level: LevelInt) -> Option<&Vec<StringKey>>;
     /// Gets the distinct moves a Pokemon can learn through leveling up.
@@ -35,9 +36,10 @@ impl LearnableMovesImpl {
 
 impl LearnableMoves for LearnableMovesImpl {
     /// Adds a new level move the Pokemon can learn.
-    fn add_level_move(&mut self, level: LevelInt, m: &StringKey) {
-        self.learned_by_level.get_mut(level as usize).unwrap().push(m.clone());
+    fn add_level_move(&mut self, level: LevelInt, m: &StringKey) -> Result<()> {
+        self.learned_by_level.get_mut_res(level as usize)?.push(m.clone());
         self.distinct_level_moves.insert(m.clone());
+        Ok(())
     }
 
     /// Gets all moves a Pokemon can learn when leveling up to a specific level.
@@ -52,14 +54,16 @@ impl LearnableMoves for LearnableMovesImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub(crate) mod tests {
     use super::*;
 
     #[test]
     fn adds_level_moves() {
         let mut moves = LearnableMovesImpl::new(100);
-        moves.add_level_move(1, &"foo".into());
-        moves.add_level_move(1, &"bar".into());
+        moves.add_level_move(1, &"foo".into()).unwrap();
+        moves.add_level_move(1, &"bar".into()).unwrap();
 
         let m = moves.get_learned_by_level(1u8).unwrap();
         assert_eq!(m.len(), 2);
@@ -71,8 +75,8 @@ pub(crate) mod tests {
     fn adds_two_same_moves_at_different_level() {
         let mut moves = LearnableMovesImpl::new(100);
 
-        moves.add_level_move(1, &"foo".into());
-        moves.add_level_move(5, &"foo".into());
+        moves.add_level_move(1, &"foo".into()).unwrap();
+        moves.add_level_move(5, &"foo".into()).unwrap();
 
         let m = moves.get_learned_by_level(1u8).unwrap();
         assert_eq!(m.len(), 1);
diff --git a/src/static_data/species_data/species.rs b/src/static_data/species_data/species.rs
index 29bd86a..e920f5f 100755
--- a/src/static_data/species_data/species.rs
+++ b/src/static_data/species_data/species.rs
@@ -1,3 +1,4 @@
+use anyhow_ext::{anyhow, Result};
 use std::fmt::Debug;
 use std::sync::{Arc, LazyLock};
 
@@ -34,7 +35,7 @@ pub trait Species: ValueIdentifiable + Debug {
     /// Gets a form by the hash of its name.
     fn get_form_by_hash(&self, name_hash: u32) -> Option<Arc<dyn Form>>;
     /// Gets the form the Pokemon will have by default, if no other form is specified.
-    fn get_default_form(&self) -> Arc<dyn Form>;
+    fn get_default_form(&self) -> Result<Arc<dyn Form>>;
     /// Gets a random gender.
     fn get_random_gender(&self, rand: &mut Random) -> Gender;
     /// Check whether the Pokemon has a specific flag set.
@@ -145,8 +146,13 @@ impl Species for SpeciesImpl {
     }
 
     /// Gets the form the Pokemon will have by default, if no other form is specified.
-    fn get_default_form(&self) -> Arc<dyn Form> {
-        self.forms.read().get(&get_default_key()).unwrap().clone()
+    fn get_default_form(&self) -> Result<Arc<dyn Form>> {
+        Ok(self
+            .forms
+            .read()
+            .get(&get_default_key())
+            .ok_or(anyhow!("No default form for species"))?
+            .clone())
     }
 
     /// Gets a random gender.
@@ -177,6 +183,8 @@ impl ValueIdentifiable for SpeciesImpl {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 pub(crate) mod tests {
     use super::*;
 
@@ -194,7 +202,7 @@ pub(crate) mod tests {
             fn add_form(&self, id: StringKey, form: Arc<dyn Form>);
             fn get_form(&self, id: &StringKey) -> Option<Arc<dyn Form>>;
             fn get_form_by_hash(&self, name_hash: u32) -> Option<Arc<dyn Form>>;
-            fn get_default_form(&self) -> Arc<dyn Form>;
+            fn get_default_form(&self) -> Result<Arc<dyn Form>>;
             fn get_random_gender(&self, rand: &mut Random) -> Gender;
             fn has_flag(&self, key: &StringKey) -> bool;
             fn has_flag_by_hash(&self, key_hash: u32) -> bool;
diff --git a/src/static_data/statistic_set.rs b/src/static_data/statistic_set.rs
index 6bd32e7..d6bcb38 100755
--- a/src/static_data/statistic_set.rs
+++ b/src/static_data/statistic_set.rs
@@ -275,10 +275,12 @@ where
     T: PrimInt,
 {
     /// The lowest value a value on the set can have.
+    #[allow(clippy::unwrap_used)] // Should never fail
     pub fn min() -> T {
         <T as NumCast>::from(MIN).unwrap()
     }
     /// The highest value a value on the set can have.
+    #[allow(clippy::unwrap_used)] // Should never fail
     pub fn max() -> T {
         <T as NumCast>::from(MAX).unwrap()
     }
diff --git a/src/utils/random.rs b/src/utils/random.rs
index 3b7cb0f..37eb84c 100755
--- a/src/utils/random.rs
+++ b/src/utils/random.rs
@@ -91,6 +91,8 @@ impl Random {
 }
 
 #[cfg(test)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::unwrap_used)]
 mod tests {
     use std::hint::black_box;
     use test::Bencher;
diff --git a/src/utils/string_key.rs b/src/utils/string_key.rs
index d4d5820..158f555 100755
--- a/src/utils/string_key.rs
+++ b/src/utils/string_key.rs
@@ -29,6 +29,7 @@ static EMPTY: LazyLock<StringKey> = LazyLock::new(|| StringKey::new(""));
 
 impl StringKey {
     #[inline(always)]
+    #[allow(clippy::indexing_slicing)] // Should never fail. More efficient than using get.
     /// Gets the hash of a string.
     pub const fn get_hash(s: &str) -> u32 {
         let mut crc: u32 = 0xffffffff;
@@ -119,6 +120,7 @@ impl Display for StringKey {
 }
 
 impl From<&CStr> for StringKey {
+    #[allow(clippy::unwrap_used)] // Fix later.
     fn from(s: &CStr) -> Self {
         StringKey::new(s.to_str().unwrap())
     }
diff --git a/tests/common/library_loader.rs b/tests/common/library_loader.rs
index a511af2..fd50925 100755
--- a/tests/common/library_loader.rs
+++ b/tests/common/library_loader.rs
@@ -121,7 +121,9 @@ pub fn load_types(path: &String) -> Box<dyn TypeLibrary> {
 
         for (i, v) in record.iter().skip(1).enumerate() {
             let effectiveness = v.parse::<f32>().unwrap();
-            type_library.set_effectiveness(offensive_type_id, ((i + 1) as u8).into(), effectiveness);
+            type_library
+                .set_effectiveness(offensive_type_id, ((i + 1) as u8).into(), effectiveness)
+                .unwrap();
         }
     }
     type_library
@@ -463,7 +465,7 @@ fn parse_moves(value: &Value, move_library: &Box<dyn MoveLibrary>) -> Box<dyn Le
         let name = level_move.get("name").unwrap().as_str().unwrap().into();
         let level = level_move.get("level").unwrap().as_u64().unwrap() as LevelInt;
         assert!(move_library.get(&name).is_some());
-        moves.add_level_move(level, &name);
+        moves.add_level_move(level, &name).unwrap();
     }
 
     Box::new(moves)
@@ -500,10 +502,12 @@ fn test_type_library_loaded() {
     let types = load_types(&path.to_str().unwrap().to_string());
 
     assert_eq!(
-        types.get_effectiveness(
-            types.get_type_id(&"fire".into()).unwrap(),
-            &[types.get_type_id(&"grass".into()).unwrap()],
-        ),
+        types
+            .get_effectiveness(
+                types.get_type_id(&"fire".into()).unwrap(),
+                &[types.get_type_id(&"grass".into()).unwrap()],
+            )
+            .unwrap(),
         2.0
     );
 }