diff --git a/src/dynamic_data/flow/target_resolver.rs b/src/dynamic_data/flow/target_resolver.rs
index a4568a2..5004ed3 100644
--- a/src/dynamic_data/flow/target_resolver.rs
+++ b/src/dynamic_data/flow/target_resolver.rs
@@ -2,6 +2,7 @@ use crate::dynamic_data::models::battle::Battle;
 use crate::dynamic_data::models::pokemon::Pokemon;
 use crate::static_data::MoveTarget;
 use num_traits::abs;
+use std::ops::Deref;
 use std::sync::Arc;
 
 pub type TargetList<'own, 'library> = Vec<Option<Arc<Pokemon<'own, 'library>>>>;
@@ -9,7 +10,7 @@ pub type TargetList<'own, 'library> = Vec<Option<Arc<Pokemon<'own, 'library>>>>;
 fn get_all_targets<'b, 'library>(battle: &Battle<'b, 'library>) -> TargetList<'b, 'library> {
     let mut v = Vec::with_capacity(battle.pokemon_per_side() as usize * battle.number_of_sides() as usize);
     for side in battle.sides() {
-        for pokemon in side.pokemon() {
+        for pokemon in side.pokemon().deref() {
             v.push(pokemon.as_ref().cloned());
         }
     }
@@ -106,7 +107,7 @@ pub fn resolve_targets<'b, 'library>(
         MoveTarget::AllAdjacentOpponent => get_all_adjacent_opponent(side, index, battle),
         MoveTarget::AllAlly | MoveTarget::AllOpponent => {
             let mut v = Vec::new();
-            for pokemon in battle.sides()[side as usize].pokemon() {
+            for pokemon in battle.sides()[side as usize].pokemon().deref() {
                 v.push(pokemon.as_ref().cloned());
             }
             v
diff --git a/src/dynamic_data/flow/turn_runner.rs b/src/dynamic_data/flow/turn_runner.rs
index a18d337..f495769 100644
--- a/src/dynamic_data/flow/turn_runner.rs
+++ b/src/dynamic_data/flow/turn_runner.rs
@@ -185,113 +185,101 @@ impl<'own, 'library> Battle<'own, 'library> {
             if target.is_fainted() {
                 break;
             }
-            {
-                let mut hit_type = executing_move.use_move().move_type();
-                script_hook!(
-                    change_move_type,
-                    executing_move,
-                    executing_move,
-                    target,
-                    hit_index,
-                    &mut hit_type
-                );
-                executing_move
-                    .get_hit_from_raw_index_mut(target_hit_stat + hit_index as usize)
-                    .set_move_type(hit_type);
-                let mut effectiveness = self
+            let used_move = executing_move.use_move();
+            let mut hit_type = used_move.move_type();
+            script_hook!(
+                change_move_type,
+                executing_move,
+                executing_move,
+                target,
+                hit_index,
+                &mut hit_type
+            );
+            let hit_data = executing_move.get_hit_from_raw_index(target_hit_stat + hit_index as usize);
+            hit_data.set_move_type(hit_type);
+            let mut effectiveness = self
+                .library()
+                .static_data()
+                .types()
+                .get_effectiveness(hit_type, target.types());
+            script_hook!(
+                change_effectiveness,
+                executing_move,
+                executing_move,
+                target,
+                hit_index,
+                &mut effectiveness
+            );
+            hit_data.set_effectiveness(effectiveness);
+            let mut block_critical = false;
+            script_hook!(
+                block_critical,
+                executing_move,
+                executing_move,
+                target,
+                hit_index,
+                &mut block_critical
+            );
+            script_hook!(
+                block_incoming_critical,
+                target,
+                executing_move,
+                target,
+                hit_index,
+                &mut block_critical
+            );
+
+            if !block_critical {
+                let is_critical = self
                     .library()
-                    .static_data()
-                    .types()
-                    .get_effectiveness(hit_type, target.types());
-                script_hook!(
-                    change_effectiveness,
-                    executing_move,
-                    executing_move,
-                    target,
-                    hit_index,
-                    &mut effectiveness
-                );
-                executing_move
-                    .get_hit_from_raw_index_mut(target_hit_stat + hit_index as usize)
-                    .set_effectiveness(effectiveness);
-                let mut block_critical = false;
-                script_hook!(
-                    block_critical,
-                    executing_move,
-                    executing_move,
-                    target,
-                    hit_index,
-                    &mut block_critical
-                );
-                script_hook!(
-                    block_incoming_critical,
-                    target,
-                    executing_move,
-                    target,
-                    hit_index,
-                    &mut block_critical
-                );
+                    .misc_library()
+                    .is_critical(self, executing_move, target, hit_index);
+                hit_data.set_critical(is_critical);
+            }
+            let base_power = self.library().damage_calculator().get_base_power(
+                executing_move,
+                target,
+                hit_index,
+                executing_move.get_hit_data(target, hit_index)?,
+            );
+            hit_data.set_base_power(base_power);
+            let damage = self.library().damage_calculator().get_damage(
+                executing_move,
+                target,
+                hit_index,
+                executing_move.get_hit_data(target, hit_index)?,
+            );
+            hit_data.set_damage(damage);
 
-                if !block_critical {
-                    let is_critical =
-                        self.library()
-                            .misc_library()
-                            .is_critical(self, executing_move, target, hit_index);
-                    executing_move
-                        .get_hit_from_raw_index_mut(target_hit_stat + hit_index as usize)
-                        .set_critical(is_critical);
+            if used_move.category() == MoveCategory::Status {
+                if let Some(secondary_effect) = used_move.secondary_effect() {
+                    let secondary_effect_chance = secondary_effect.chance();
+                    if secondary_effect_chance == -1.0
+                        || self
+                            .random()
+                            .effect_chance(secondary_effect_chance, executing_move, target, hit_index)
+                    {
+                        script_hook!(on_secondary_effect, executing_move, executing_move, target, hit_index);
+                        // TODO: on fail
+                    }
                 }
-                let base_power = self.library().damage_calculator().get_base_power(
-                    executing_move,
-                    target,
-                    hit_index,
-                    executing_move.get_hit_data(target, hit_index)?,
-                );
-                executing_move
-                    .get_hit_from_raw_index_mut(target_hit_stat + hit_index as usize)
-                    .set_base_power(base_power);
-                let damage = self.library().damage_calculator().get_damage(
-                    executing_move,
-                    target,
-                    hit_index,
-                    executing_move.get_hit_data(target, hit_index)?,
-                );
-                executing_move
-                    .get_hit_from_raw_index_mut(target_hit_stat + hit_index as usize)
-                    .set_damage(damage);
-
-                if executing_move.use_move().category() == MoveCategory::Status {
-                    if executing_move.use_move().has_secondary_effect() {
-                        let secondary_effect_chance = executing_move.use_move().secondary_effect().chance();
-                        if secondary_effect_chance == -1.0
-                            || self
-                                .random()
-                                .effect_chance(secondary_effect_chance, executing_move, target, hit_index)
-                        {
-                            script_hook!(on_secondary_effect, executing_move, executing_move, target, hit_index);
-                            // TODO: on fail
-                        }
+            } else {
+                let mut damage = hit_data.damage();
+                let current_health = target.current_health();
+                if damage > current_health {
+                    damage = current_health;
+                    hit_data.set_damage(damage);
+                }
+                if damage > 0 {
+                    target.damage(damage, DamageSource::AttackDamage);
+                    if !target.is_fainted() {
+                        script_hook!(on_incoming_hit, target, executing_move, target, hit_index);
+                    } else {
+                        script_hook!(on_opponent_faints, executing_move, executing_move, target, hit_index);
                     }
-                } else {
-                    let mut damage = executing_move
-                        .get_hit_from_raw_index(target_hit_stat + hit_index as usize)
-                        .damage();
-                    let current_health = target.current_health();
-                    if damage > current_health {
-                        damage = current_health;
-                        executing_move
-                            .get_hit_from_raw_index_mut(target_hit_stat + hit_index as usize)
-                            .set_damage(damage);
-                    }
-                    if damage > 0 {
-                        target.damage(damage, DamageSource::AttackDamage);
-                        if !target.is_fainted() {
-                            script_hook!(on_incoming_hit, target, executing_move, target, hit_index);
-                        } else {
-                            script_hook!(on_opponent_faints, executing_move, executing_move, target, hit_index);
-                        }
 
-                        if executing_move.use_move().has_secondary_effect() && !target.is_fainted() {
+                    if !target.is_fainted() {
+                        if let Some(secondary_effect) = used_move.secondary_effect() {
                             let mut prevent_secondary = false;
                             script_hook!(
                                 prevent_secondary_effect,
@@ -302,7 +290,7 @@ impl<'own, 'library> Battle<'own, 'library> {
                                 &mut prevent_secondary
                             );
                             if !prevent_secondary {
-                                let secondary_effect_chance = executing_move.use_move().secondary_effect().chance();
+                                let secondary_effect_chance = secondary_effect.chance();
                                 if secondary_effect_chance == -1.0
                                     || self.random().effect_chance(
                                         secondary_effect_chance,
diff --git a/src/dynamic_data/libraries/misc_library.rs b/src/dynamic_data/libraries/misc_library.rs
index b82ffa9..5f5a4d9 100644
--- a/src/dynamic_data/libraries/misc_library.rs
+++ b/src/dynamic_data/libraries/misc_library.rs
@@ -52,7 +52,7 @@ impl<'library> Gen7MiscLibrary<'library> {
             255,
             MoveTarget::Any,
             0,
-            SecondaryEffect::new(-1.0, StringKey::new("struggle"), vec![]),
+            Some(SecondaryEffect::new(-1.0, StringKey::new("struggle"), vec![])),
             HashSet::new(),
         ));
         let struggle_ptr = Box::into_raw(struggle_data);
diff --git a/src/dynamic_data/models/battle.rs b/src/dynamic_data/models/battle.rs
index 568ac38..c0d3225 100644
--- a/src/dynamic_data/models/battle.rs
+++ b/src/dynamic_data/models/battle.rs
@@ -35,7 +35,7 @@ pub struct Battle<'own, 'library> {
     event_hook: EventHook,
     history_holder: Box<HistoryHolder>,
     current_turn: AtomicU32,
-    volatile_scripts: Arc<RwLock<ScriptSet>>,
+    volatile_scripts: Arc<ScriptSet>,
     last_turn_time: Atomic<chrono::Duration>,
 
     script_source_data: RwLock<ScriptSourceData>,
@@ -134,16 +134,13 @@ impl<'own, 'library> Battle<'own, 'library> {
         &self.current_turn_queue
     }
 
-    pub fn get_pokemon(&self, side: u8, index: u8) -> &Option<Arc<Pokemon<'own, 'library>>> {
+    pub fn get_pokemon(&self, side: u8, index: u8) -> Option<Arc<Pokemon<'own, 'library>>> {
         let side = self.sides.get(side as usize);
-        if side.is_none() {
-            return &None;
-        }
-        let pokemon = side.unwrap().pokemon().get(index as usize);
-        if pokemon.is_none() {
-            return &None;
-        }
-        pokemon.unwrap()
+        side?;
+        let pokemon_read_lock = side.unwrap().pokemon();
+        let pokemon = pokemon_read_lock.get(index as usize);
+        pokemon?;
+        pokemon.unwrap().clone()
     }
 
     pub fn can_slot_be_filled(&self, side: u8, index: u8) -> bool {
@@ -288,7 +285,7 @@ impl<'own, 'library> Battle<'own, 'library> {
 }
 
 impl<'own, 'library> VolatileScripts<'own> for Battle<'own, 'library> {
-    fn volatile_scripts(&self) -> &Arc<RwLock<ScriptSet>> {
+    fn volatile_scripts(&self) -> &Arc<ScriptSet> {
         &self.volatile_scripts
     }
 
diff --git a/src/dynamic_data/models/battle_side.rs b/src/dynamic_data/models/battle_side.rs
index fd866cd..19b65e9 100644
--- a/src/dynamic_data/models/battle_side.rs
+++ b/src/dynamic_data/models/battle_side.rs
@@ -8,22 +8,23 @@ use crate::dynamic_data::script_handling::script_set::ScriptSet;
 use crate::dynamic_data::script_handling::volatile_scripts::VolatileScripts;
 use crate::dynamic_data::script_handling::{ScriptSource, ScriptSourceData, ScriptWrapper};
 use crate::{script_hook, PkmnResult, StringKey};
-use parking_lot::RwLock;
+use parking_lot::lock_api::RwLockReadGuard;
+use parking_lot::{RawRwLock, RwLock};
 use std::ops::Deref;
-use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::atomic::{AtomicBool, AtomicU8, Ordering};
 use std::sync::Arc;
 
 #[derive(Debug)]
 pub struct BattleSide<'own, 'library> {
     index: u8,
     pokemon_per_side: u8,
-    pokemon: Vec<Option<Arc<Pokemon<'own, 'library>>>>,
+    pokemon: RwLock<Vec<Option<Arc<Pokemon<'own, 'library>>>>>,
     choices: RwLock<Vec<Option<TurnChoice<'own, 'library>>>>,
     fillable_slots: Vec<AtomicBool>,
-    choices_set: u8,
+    choices_set: AtomicU8,
     battle: *mut Battle<'own, 'library>,
     has_fled_battle: bool,
-    volatile_scripts: Arc<RwLock<ScriptSet>>,
+    volatile_scripts: Arc<ScriptSet>,
 
     script_source_data: RwLock<ScriptSourceData>,
 }
@@ -40,6 +41,7 @@ impl<'own, 'library> BattleSide<'own, 'library> {
             fillable_slots.push(AtomicBool::new(false));
         }
         let choices = RwLock::new(choices);
+        let pokemon = RwLock::new(pokemon);
 
         Self {
             index,
@@ -47,7 +49,7 @@ impl<'own, 'library> BattleSide<'own, 'library> {
             pokemon,
             choices,
             fillable_slots,
-            choices_set: 0,
+            choices_set: AtomicU8::new(0),
             battle: std::ptr::null_mut::<Battle>(),
             has_fled_battle: false,
             volatile_scripts: Default::default(),
@@ -65,8 +67,8 @@ impl<'own, 'library> BattleSide<'own, 'library> {
     pub fn pokemon_per_side(&self) -> u8 {
         self.pokemon_per_side
     }
-    pub fn pokemon(&self) -> &Vec<Option<Arc<Pokemon<'own, 'library>>>> {
-        &self.pokemon
+    pub fn pokemon(&self) -> RwLockReadGuard<'_, RawRwLock, Vec<Option<Arc<Pokemon<'own, 'library>>>>> {
+        self.pokemon.read()
     }
     pub fn choices(&self) -> &RwLock<Vec<Option<TurnChoice<'own, 'library>>>> {
         &self.choices
@@ -76,7 +78,7 @@ impl<'own, 'library> BattleSide<'own, 'library> {
         &self.fillable_slots
     }
     pub fn choices_set(&self) -> u8 {
-        self.choices_set
+        self.choices_set.load(Ordering::SeqCst)
     }
     pub fn battle(&self) -> &Battle<'own, 'library> {
         unsafe { self.battle.as_ref().unwrap() }
@@ -84,19 +86,19 @@ impl<'own, 'library> BattleSide<'own, 'library> {
     pub fn has_fled_battle(&self) -> bool {
         self.has_fled_battle
     }
-    pub fn volatile_scripts(&self) -> &Arc<RwLock<ScriptSet>> {
+    pub fn volatile_scripts(&self) -> &Arc<ScriptSet> {
         &self.volatile_scripts
     }
 
     pub fn all_choices_set(&self) -> bool {
-        self.choices_set == self.pokemon_per_side
+        self.choices_set() == self.pokemon_per_side
     }
 
     /// Returns true if there are slots that need to be filled with a new pokemon, that have parties
     /// responsible for them. Returns false if all slots are filled with usable pokemon, or slots are
     /// empty, but can't be filled by any party anymore.
     pub fn all_slots_filled(&self) -> bool {
-        for (i, pokemon) in self.pokemon.iter().enumerate() {
+        for (i, pokemon) in self.pokemon.read().iter().enumerate() {
             if (!pokemon.is_none() || !pokemon.as_ref().unwrap().is_usable())
                 && self.battle().can_slot_be_filled(self.index, i as u8)
             {
@@ -106,12 +108,12 @@ impl<'own, 'library> BattleSide<'own, 'library> {
         true
     }
 
-    pub fn set_choice(&mut self, choice: TurnChoice<'own, 'library>) {
-        for (index, pokemon_slot) in self.pokemon.iter().enumerate() {
+    pub fn set_choice(&self, choice: TurnChoice<'own, 'library>) {
+        for (index, pokemon_slot) in self.pokemon.read().iter().enumerate() {
             if let Some(pokemon) = pokemon_slot {
                 if std::ptr::eq(pokemon.deref(), choice.user().deref()) {
                     self.choices.write()[index] = Some(choice);
-                    self.choices_set += 1;
+                    self.choices_set.fetch_add(1, Ordering::SeqCst);
                     return;
                 }
             }
@@ -126,17 +128,19 @@ impl<'own, 'library> BattleSide<'own, 'library> {
     }
 
     pub fn force_clear_pokemon(&mut self, index: u8) {
-        self.pokemon[index as usize] = None;
+        self.pokemon.write()[index as usize] = None;
     }
 
-    pub fn set_pokemon(&mut self, index: u8, pokemon: Option<Arc<Pokemon<'own, 'library>>>) {
-        let old = &mut self.pokemon[index as usize];
-        if let Some(old_pokemon) = old {
-            script_hook!(on_remove, old_pokemon,);
-            old_pokemon.set_on_battlefield(false);
+    pub fn set_pokemon(&self, index: u8, pokemon: Option<Arc<Pokemon<'own, 'library>>>) {
+        {
+            let old = &self.pokemon.read()[index as usize];
+            if let Some(old_pokemon) = old {
+                script_hook!(on_remove, old_pokemon,);
+                old_pokemon.set_on_battlefield(false);
+            }
         }
-        self.pokemon[index as usize] = pokemon;
-        let pokemon = &self.pokemon[index as usize];
+        self.pokemon.write()[index as usize] = pokemon;
+        let pokemon = &self.pokemon.read()[index as usize];
         if let Some(pokemon) = pokemon {
             pokemon.set_battle_data(self.battle, self.index);
             pokemon.set_on_battlefield(true);
@@ -168,7 +172,7 @@ impl<'own, 'library> BattleSide<'own, 'library> {
     }
 
     pub fn is_pokemon_on_side(&self, pokemon: Arc<Pokemon<'own, 'library>>) -> bool {
-        for p in self.pokemon.iter().flatten() {
+        for p in self.pokemon.read().iter().flatten() {
             if std::ptr::eq(p.deref().deref(), pokemon.deref()) {
                 return true;
             }
@@ -181,7 +185,7 @@ impl<'own, 'library> BattleSide<'own, 'library> {
     }
 
     pub fn is_slot_unfillable(&self, pokemon: Arc<Pokemon<'own, 'library>>) -> bool {
-        for (i, slot) in self.pokemon.iter().enumerate() {
+        for (i, slot) in self.pokemon.read().iter().enumerate() {
             if let Some(p) = slot {
                 if std::ptr::eq(p.deref().deref(), pokemon.deref()) {
                     return self.fillable_slots[i].load(Ordering::Relaxed);
@@ -243,7 +247,7 @@ impl<'own, 'library> BattleSide<'own, 'library> {
             return false;
         }
 
-        self.pokemon.swap(a as usize, b as usize);
+        self.pokemon.write().swap(a as usize, b as usize);
         self.battle().event_hook().trigger(Event::Swap {
             side_index: self.index,
             index_a: a,
@@ -254,7 +258,7 @@ impl<'own, 'library> BattleSide<'own, 'library> {
 }
 
 impl<'own, 'library> VolatileScripts<'own> for BattleSide<'own, 'library> {
-    fn volatile_scripts(&self) -> &Arc<RwLock<ScriptSet>> {
+    fn volatile_scripts(&self) -> &Arc<ScriptSet> {
         &self.volatile_scripts
     }
 
diff --git a/src/dynamic_data/models/executing_move.rs b/src/dynamic_data/models/executing_move.rs
index 3b1f41c..ba7ef8f 100644
--- a/src/dynamic_data/models/executing_move.rs
+++ b/src/dynamic_data/models/executing_move.rs
@@ -5,57 +5,59 @@ use crate::dynamic_data::script_handling::script::ScriptContainer;
 use crate::dynamic_data::script_handling::{ScriptSource, ScriptSourceData, ScriptWrapper};
 use crate::static_data::MoveData;
 use crate::{PkmnResult, PokemonError};
+use atomic::Atomic;
 use parking_lot::RwLock;
 use std::ops::Deref;
+use std::sync::atomic::{AtomicBool, AtomicU32, AtomicU8, Ordering};
 use std::sync::Arc;
 
 #[derive(Default, Debug)]
 pub struct HitData {
-    critical: bool,
-    base_power: u8,
-    effectiveness: f32,
-    damage: u32,
-    move_type: u8,
-    has_failed: bool,
+    critical: AtomicBool,
+    base_power: AtomicU8,
+    effectiveness: Atomic<f32>,
+    damage: AtomicU32,
+    move_type: AtomicU8,
+    has_failed: AtomicBool,
 }
 
 impl HitData {
     pub fn is_critical(&self) -> bool {
-        self.critical
+        self.critical.load(Ordering::Relaxed)
     }
     pub fn base_power(&self) -> u8 {
-        self.base_power
+        self.base_power.load(Ordering::Relaxed)
     }
     pub fn effectiveness(&self) -> f32 {
-        self.effectiveness
+        self.effectiveness.load(Ordering::Relaxed)
     }
     pub fn damage(&self) -> u32 {
-        self.damage
+        self.damage.load(Ordering::Relaxed)
     }
     pub fn move_type(&self) -> u8 {
-        self.move_type
+        self.move_type.load(Ordering::Relaxed)
     }
     pub fn has_failed(&self) -> bool {
-        self.has_failed
+        self.has_failed.load(Ordering::Relaxed)
     }
 
-    pub fn set_critical(&mut self, value: bool) {
-        self.critical = value;
+    pub fn set_critical(&self, value: bool) {
+        self.critical.store(value, Ordering::SeqCst);
     }
-    pub fn set_base_power(&mut self, value: u8) {
-        self.base_power = value;
+    pub fn set_base_power(&self, value: u8) {
+        self.base_power.store(value, Ordering::SeqCst);
     }
-    pub fn set_effectiveness(&mut self, value: f32) {
-        self.effectiveness = value;
+    pub fn set_effectiveness(&self, value: f32) {
+        self.effectiveness.store(value, Ordering::SeqCst);
     }
-    pub fn set_damage(&mut self, value: u32) {
-        self.damage = value;
+    pub fn set_damage(&self, value: u32) {
+        self.damage.store(value, Ordering::SeqCst);
     }
-    pub fn set_move_type(&mut self, value: u8) {
-        self.move_type = value;
+    pub fn set_move_type(&self, value: u8) {
+        self.move_type.store(value, Ordering::SeqCst);
     }
-    pub fn fail(&mut self) {
-        self.has_failed = true;
+    pub fn fail(&self) {
+        self.has_failed.store(true, Ordering::SeqCst);
     }
 }
 
@@ -156,9 +158,6 @@ impl<'own, 'battle, 'library> ExecutingMove<'own, 'battle, 'library> {
     pub(crate) fn get_hit_from_raw_index(&self, index: usize) -> &HitData {
         &self.hits[index]
     }
-    pub(crate) fn get_hit_from_raw_index_mut(&mut self, index: usize) -> &mut HitData {
-        &mut self.hits[index]
-    }
 }
 
 impl<'own, 'battle, 'library> ScriptSource<'own> for ExecutingMove<'own, 'battle, 'library> {
diff --git a/src/dynamic_data/models/pokemon.rs b/src/dynamic_data/models/pokemon.rs
index 993fc11..f1d31a2 100644
--- a/src/dynamic_data/models/pokemon.rs
+++ b/src/dynamic_data/models/pokemon.rs
@@ -73,7 +73,7 @@ where
     unique_identifier: u32,
     gender: Gender,
     coloring: u8,
-    held_item: Option<&'own Item>,
+    held_item: RwLock<Option<&'own Item>>,
     current_health: AtomicU32,
 
     weight: Atomic<f32>,
@@ -104,7 +104,7 @@ where
     held_item_trigger_script: ScriptContainer,
     ability_script: ScriptContainer,
     status_script: ScriptContainer,
-    volatile: Arc<RwLock<ScriptSet>>,
+    volatile: Arc<ScriptSet>,
 
     script_source_data: RwLock<ScriptSourceData>,
 }
@@ -144,7 +144,7 @@ impl<'own, 'library> Pokemon<'own, 'library> {
             unique_identifier,
             gender,
             coloring,
-            held_item: None,
+            held_item: RwLock::new(None),
             current_health: AtomicU32::new(1),
             weight: Atomic::new(weight),
             height: Atomic::new(height),
@@ -216,27 +216,27 @@ impl<'own, 'library> Pokemon<'own, 'library> {
     pub fn coloring(&self) -> u8 {
         self.coloring
     }
-    pub fn held_item(&self) -> Option<&'own Item> {
-        self.held_item
+    pub fn held_item(&self) -> &RwLock<Option<&'own Item>> {
+        &self.held_item
     }
     pub fn has_held_item(&self, name: &StringKey) -> bool {
         // Only true if we have an item, and the item name is the same as the requested item.
-        if let Some(v) = self.held_item {
+        if let Some(v) = self.held_item.read().deref() {
             return v.name() == name;
         }
         false
     }
-    pub fn set_held_item(&mut self, item: &'own Item) {
-        self.held_item = Some(item);
+    pub fn set_held_item(&self, item: &'own Item) -> Option<&'own Item> {
+        self.held_item.write().replace(item)
     }
-    pub fn remove_held_item(&mut self) {
-        self.held_item = None;
+    pub fn remove_held_item(&self) -> Option<&'own Item> {
+        self.held_item.write().take()
     }
-    pub fn consume_held_item(&mut self) -> bool {
-        if self.held_item.is_none() {
+    pub fn consume_held_item(&self) -> bool {
+        if self.held_item.read().is_none() {
             return false;
         }
-        let script = self.library.load_item_script(self.held_item.unwrap()).unwrap();
+        let script = self.library.load_item_script(self.held_item.read().unwrap()).unwrap();
         if script.is_none() {
             return false;
         }
@@ -408,8 +408,10 @@ impl<'own, 'library> Pokemon<'own, 'library> {
         let diff_health = (self.max_health() - old_health) as i32;
         if self.current_health() == 0 && (self.current_health() as i32) < -diff_health {
             self.current_health.store(0, Ordering::SeqCst);
+        } else if diff_health < 0 {
+            self.current_health.fetch_sub(-diff_health as u32, Ordering::SeqCst);
         } else {
-            self.current_health.fetch_add(diff_health as u32, Ordering::Acquire);
+            self.current_health.fetch_add(diff_health as u32, Ordering::SeqCst);
         }
         // TODO: consider form specific attacks?
 
@@ -450,7 +452,7 @@ impl<'own, 'library> Pokemon<'own, 'library> {
         if let Some(data) = &mut r.deref() {
             data.on_battle_field.store(value, Ordering::SeqCst);
             if !value {
-                self.volatile.write().clear();
+                self.volatile.clear();
                 self.weight.store(self.form.weight(), Ordering::SeqCst);
                 self.height.store(self.form.height(), Ordering::SeqCst);
             }
@@ -572,7 +574,7 @@ impl<'own, 'library> ScriptSource<'own> for Pokemon<'own, 'library> {
 }
 
 impl<'own, 'library> VolatileScripts<'own> for Pokemon<'own, 'library> {
-    fn volatile_scripts(&self) -> &Arc<RwLock<ScriptSet>> {
+    fn volatile_scripts(&self) -> &Arc<ScriptSet> {
         &self.volatile
     }
 
diff --git a/src/dynamic_data/script_handling/mod.rs b/src/dynamic_data/script_handling/mod.rs
index e5e63f3..ae4608f 100644
--- a/src/dynamic_data/script_handling/mod.rs
+++ b/src/dynamic_data/script_handling/mod.rs
@@ -56,12 +56,13 @@ macro_rules! run_scripts {
                     }
                 }
                 ScriptWrapper::Set(s) => {
-                    if let Some(s) = s.upgrade() {
-                        for s in s.read().get_underlying() {
-                            if let Some(s) = s.1.get() {
+                    if let Some(set) = s.upgrade() {
+                        let current_scripts = set.get_owning_iterator();
+                        for s in current_scripts {
+                            if let Some(s) = s.get() {
                                 let s = s.read();
                                 if let Some(s) = s.deref() {
-                                    if !s.is_suppressed() {
+                                    if !s.is_suppressed() && set.has(s.name()) {
                                         s.$hook_name($($parameters),*);
                                     }
                                 }
@@ -100,7 +101,7 @@ pub trait ScriptSource<'a> {
 #[derive(Debug)]
 pub enum ScriptWrapper {
     Script(Weak<RwLock<Option<Arc<dyn Script>>>>),
-    Set(Weak<RwLock<ScriptSet>>),
+    Set(Weak<ScriptSet>),
 }
 
 impl From<&ScriptContainer> for ScriptWrapper {
@@ -109,8 +110,8 @@ impl From<&ScriptContainer> for ScriptWrapper {
     }
 }
 
-impl From<&Arc<RwLock<ScriptSet>>> for ScriptWrapper {
-    fn from(c: &Arc<RwLock<ScriptSet>>) -> Self {
+impl From<&Arc<ScriptSet>> for ScriptWrapper {
+    fn from(c: &Arc<ScriptSet>) -> Self {
         ScriptWrapper::Set(Arc::downgrade(c))
     }
 }
@@ -141,7 +142,7 @@ impl ScriptAggregator {
             if let ScriptWrapper::Set(set) = wrapper {
                 if let Some(set) = set.upgrade() {
                     self.set_index += 1;
-                    if self.set_index as usize >= set.read().count() {
+                    if self.set_index as usize >= set.count() {
                         self.set_index = -1;
                     } else {
                         return true;
@@ -155,7 +156,7 @@ impl ScriptAggregator {
             let wrapper = unsafe { &self.scripts.as_ref().unwrap()[self.index as usize] };
             if let ScriptWrapper::Set(s) = wrapper {
                 if let Some(set) = s.upgrade() {
-                    if set.read().count() > 0 {
+                    if set.count() > 0 {
                         self.set_index = 0;
                         return true;
                     }
@@ -181,9 +182,8 @@ impl ScriptAggregator {
                 // increment_to_next_value
                 ScriptWrapper::Script(script) => Some(script.upgrade().unwrap().into()),
                 ScriptWrapper::Set(set) => {
-                    let lock = set.as_ptr().as_ref().unwrap();
-                    let l = lock.read();
-                    let sc = l.at(self.set_index as usize);
+                    let set = set.upgrade().unwrap();
+                    let sc = set.at(self.set_index as usize);
                     return Some(sc.clone());
                 }
             };
@@ -337,13 +337,10 @@ mod tests {
 
     #[test]
     fn script_aggregator_property_iterates_script_set() {
-        let set = Arc::new(RwLock::new(ScriptSet::default()));
-        let mut mut_set = set.write();
-        mut_set.add(Arc::new(TestScript::new_with_name("test_a")));
-        mut_set.add(Arc::new(TestScript::new_with_name("test_b")));
-        mut_set.add(Arc::new(TestScript::new_with_name("test_c")));
-        // Drop so we don't have a lock on it anymore.
-        drop(mut_set);
+        let set = Arc::new(ScriptSet::default());
+        set.add(Arc::new(TestScript::new_with_name("test_a")));
+        set.add(Arc::new(TestScript::new_with_name("test_b")));
+        set.add(Arc::new(TestScript::new_with_name("test_c")));
 
         let scripts = vec![ScriptWrapper::from(&set)];
         let mut aggregator = ScriptAggregator::new(&scripts as *const Vec<ScriptWrapper>);
@@ -352,14 +349,16 @@ mod tests {
             while let Some(v) = aggregator.get_next() {
                 v.get().unwrap().read().as_ref().unwrap().on_initialize(&[]);
             }
-            let set = set.read();
-            let s = set.at(0).get_as::<TestScript>();
+            let s = set.at(0);
+            let s = s.get_as::<TestScript>();
             assert_eq!(s.test_count.load(Ordering::Relaxed), i);
             assert_eq!(s.name().str(), "test_a");
-            let s = set.at(1).get_as::<TestScript>();
+            let s = set.at(1);
+            let s = s.get_as::<TestScript>();
             assert_eq!(s.test_count.load(Ordering::Relaxed), i);
             assert_eq!(s.name().str(), "test_b");
-            let s = set.at(2).get_as::<TestScript>();
+            let s = set.at(2);
+            let s = s.get_as::<TestScript>();
             assert_eq!(s.test_count.load(Ordering::Relaxed), i);
             assert_eq!(s.name().str(), "test_c");
         }
@@ -367,13 +366,10 @@ mod tests {
 
     #[test]
     fn script_aggregator_property_iterates_script_set_when_removing_last() {
-        let set = Arc::new(RwLock::new(ScriptSet::default()));
-        let mut mut_set = set.write();
-        mut_set.add(Arc::new(TestScript::new_with_name("test_a")));
-        mut_set.add(Arc::new(TestScript::new_with_name("test_b")));
-        mut_set.add(Arc::new(TestScript::new_with_name("test_c")));
-        // Drop so we don't have a lock on it anymore.
-        drop(mut_set);
+        let set = Arc::new(ScriptSet::default());
+        set.add(Arc::new(TestScript::new_with_name("test_a")));
+        set.add(Arc::new(TestScript::new_with_name("test_b")));
+        set.add(Arc::new(TestScript::new_with_name("test_c")));
 
         let scripts = vec![ScriptWrapper::from(&set)];
         let mut aggregator = ScriptAggregator::new(&scripts as *const Vec<ScriptWrapper>);
@@ -404,22 +400,16 @@ mod tests {
             "test_b"
         );
 
-        let mut mut_set = set.write();
-        mut_set.remove(&StringKey::new("test_c"));
-        drop(mut_set);
-
+        set.remove(&StringKey::new("test_c"));
         assert!(aggregator.get_next().is_none());
     }
 
     #[test]
     fn script_aggregator_property_iterates_script_set_when_removing_middle() {
-        let set = Arc::new(RwLock::new(ScriptSet::default()));
-        let mut mut_set = set.write();
-        mut_set.add(Arc::new(TestScript::new_with_name("test_a")));
-        mut_set.add(Arc::new(TestScript::new_with_name("test_b")));
-        mut_set.add(Arc::new(TestScript::new_with_name("test_c")));
-        // Drop so we don't have a lock on it anymore.
-        drop(mut_set);
+        let set = Arc::new(ScriptSet::default());
+        set.add(Arc::new(TestScript::new_with_name("test_a")));
+        set.add(Arc::new(TestScript::new_with_name("test_b")));
+        set.add(Arc::new(TestScript::new_with_name("test_c")));
 
         let scripts = vec![ScriptWrapper::from(&set)];
         let mut aggregator = ScriptAggregator::new(&scripts as *const Vec<ScriptWrapper>);
@@ -437,9 +427,7 @@ mod tests {
             "test_a"
         );
 
-        let mut mut_set = set.write();
-        mut_set.remove(&StringKey::new("test_b"));
-        drop(mut_set);
+        set.remove(&StringKey::new("test_b"));
 
         assert_eq!(
             aggregator
diff --git a/src/dynamic_data/script_handling/script_set.rs b/src/dynamic_data/script_handling/script_set.rs
index 17d973f..9deea2f 100644
--- a/src/dynamic_data/script_handling/script_set.rs
+++ b/src/dynamic_data/script_handling/script_set.rs
@@ -1,16 +1,18 @@
 use crate::dynamic_data::script_handling::script::{Script, ScriptContainer};
 use crate::{PkmnResult, StringKey};
 use indexmap::IndexMap;
+use parking_lot::RwLock;
+use std::ops::Deref;
 use std::sync::Arc;
 
 #[derive(Debug, Default)]
 pub struct ScriptSet {
-    scripts: IndexMap<StringKey, ScriptContainer>,
+    scripts: RwLock<IndexMap<StringKey, ScriptContainer>>,
 }
 
 impl ScriptSet {
-    pub fn add(&mut self, script: Arc<dyn Script>) -> ScriptContainer {
-        if let Some(lock) = self.scripts.get(script.name()) {
+    pub fn add(&self, script: Arc<dyn Script>) -> ScriptContainer {
+        if let Some(lock) = self.scripts.read().get(script.name()) {
             if let Some(existing) = lock.get() {
                 let existing = existing.read();
                 if let Some(v) = &*existing {
@@ -19,15 +21,17 @@ impl ScriptSet {
                 }
             }
         }
-        self.scripts.insert(script.name().clone(), ScriptContainer::new(script));
-        self.scripts.last().unwrap().1.clone()
+        self.scripts
+            .write()
+            .insert(script.name().clone(), ScriptContainer::new(script));
+        self.scripts.read().last().unwrap().1.clone()
     }
 
-    pub fn stack_or_add<'b, F>(&mut self, key: &StringKey, instantiation: &'b F) -> PkmnResult<Option<ScriptContainer>>
+    pub fn stack_or_add<'b, F>(&self, key: &StringKey, instantiation: &'b F) -> PkmnResult<Option<ScriptContainer>>
     where
         F: Fn() -> PkmnResult<Option<Arc<dyn Script>>>,
     {
-        if let Some(lock) = self.scripts.get(key) {
+        if let Some(lock) = self.scripts.read().get(key) {
             if let Some(existing) = lock.get() {
                 let existing = existing.read();
                 if let Some(v) = &*existing {
@@ -40,19 +44,19 @@ impl ScriptSet {
         if let Some(script) = script {
             let name = script.name().clone();
             let arc = ScriptContainer::new(script);
-            self.scripts.insert(name, arc);
-            Ok(Some(self.scripts.last().unwrap().1.clone()))
+            self.scripts.write().insert(name, arc);
+            Ok(Some(self.scripts.read().last().unwrap().1.clone()))
         } else {
             Ok(None)
         }
     }
 
-    pub fn get(&self, key: &StringKey) -> Option<&ScriptContainer> {
-        self.scripts.get(key)
+    pub fn get(&self, key: &StringKey) -> Option<ScriptContainer> {
+        self.scripts.read().get(key).cloned()
     }
 
-    pub fn remove(&mut self, key: &StringKey) {
-        let value = self.scripts.shift_remove(key);
+    pub fn remove(&self, key: &StringKey) {
+        let value = self.scripts.write().shift_remove(key);
         if let Some(script) = value {
             if let Some(script) = script.get() {
                 let script = script.read();
@@ -62,30 +66,35 @@ impl ScriptSet {
         }
     }
 
-    pub fn clear(&mut self) {
-        for script in &self.scripts {
+    pub fn clear(&self) {
+        for script in self.scripts.read().deref() {
             if let Some(script) = script.1.get() {
                 let script = script.read();
                 script.as_ref().unwrap().on_remove();
                 script.as_ref().unwrap().mark_for_deletion();
             }
         }
-        self.scripts.clear();
+        self.scripts.write().clear();
     }
 
     pub fn has(&self, key: &StringKey) -> bool {
-        self.scripts.contains_key(key)
+        self.scripts.read().contains_key(key)
     }
 
-    pub fn at(&self, index: usize) -> &ScriptContainer {
-        &self.scripts[index]
+    pub fn at(&self, index: usize) -> ScriptContainer {
+        self.scripts.read()[index].clone()
     }
 
     pub fn count(&self) -> usize {
-        self.scripts.len()
+        self.scripts.read().len()
     }
 
-    pub(crate) fn get_underlying(&self) -> &IndexMap<StringKey, ScriptContainer> {
-        &self.scripts
+    pub(crate) fn get_owning_iterator(&self) -> Vec<ScriptContainer> {
+        let s = self.scripts.read();
+        let mut v = Vec::with_capacity(s.deref().len());
+        for script in s.deref().values() {
+            v.push(script.clone());
+        }
+        v
     }
 }
diff --git a/src/dynamic_data/script_handling/volatile_scripts.rs b/src/dynamic_data/script_handling/volatile_scripts.rs
index b54407d..2de6d2e 100644
--- a/src/dynamic_data/script_handling/volatile_scripts.rs
+++ b/src/dynamic_data/script_handling/volatile_scripts.rs
@@ -1,30 +1,26 @@
 use crate::dynamic_data::script_handling::script::{Script, ScriptContainer};
 use crate::dynamic_data::script_handling::script_set::ScriptSet;
 use crate::{PkmnResult, StringKey};
-use parking_lot::RwLock;
 use std::sync::Arc;
 
 pub trait VolatileScripts<'a> {
-    fn volatile_scripts(&self) -> &Arc<RwLock<ScriptSet>>;
+    fn volatile_scripts(&self) -> &Arc<ScriptSet>;
     fn load_volatile_script(&self, key: &StringKey) -> PkmnResult<Option<Arc<dyn Script>>>;
 
     fn has_volatile_script(&self, key: &StringKey) -> bool {
-        self.volatile_scripts().read().has(key)
+        self.volatile_scripts().has(key)
     }
 
     fn get_volatile_script(&self, key: &StringKey) -> Option<ScriptContainer> {
-        let scripts = self.volatile_scripts().read();
-        let s = scripts.get(key);
-        s.cloned()
+        self.volatile_scripts().get(key)
     }
 
     fn add_volatile_script(&mut self, key: &StringKey) -> PkmnResult<Option<ScriptContainer>> {
         self.volatile_scripts()
-            .write()
             .stack_or_add(key, &|| self.load_volatile_script(key))
     }
 
     fn remove_volatile_script(&mut self, key: &StringKey) {
-        self.volatile_scripts().write().remove(key)
+        self.volatile_scripts().remove(key)
     }
 }
diff --git a/src/static_data/libraries/move_library.rs b/src/static_data/libraries/move_library.rs
index 2b8d3d6..6b91ede 100644
--- a/src/static_data/libraries/move_library.rs
+++ b/src/static_data/libraries/move_library.rs
@@ -37,7 +37,6 @@ pub mod tests {
     use crate::static_data::libraries::data_library::DataLibrary;
     use crate::static_data::libraries::move_library::MoveLibrary;
     use crate::static_data::moves::move_data::{MoveCategory, MoveData, MoveTarget};
-    use crate::static_data::moves::secondary_effect::SecondaryEffect;
     use crate::StringKey;
     use hashbrown::HashSet;
 
@@ -51,7 +50,7 @@ pub mod tests {
             30,
             MoveTarget::Any,
             0,
-            SecondaryEffect::empty(),
+            None,
             HashSet::new(),
         )
     }
diff --git a/src/static_data/moves/move_data.rs b/src/static_data/moves/move_data.rs
index 946e501..a3e63a9 100644
--- a/src/static_data/moves/move_data.rs
+++ b/src/static_data/moves/move_data.rs
@@ -45,7 +45,7 @@ pub struct MoveData {
     base_usages: u8,
     target: MoveTarget,
     priority: i8,
-    secondary_effect: SecondaryEffect,
+    secondary_effect: Option<SecondaryEffect>,
     flags: HashSet<StringKey>,
 }
 
@@ -59,7 +59,7 @@ impl MoveData {
         base_usages: u8,
         target: MoveTarget,
         priority: i8,
-        secondary_effect: SecondaryEffect,
+        secondary_effect: Option<SecondaryEffect>,
         flags: HashSet<StringKey>,
     ) -> MoveData {
         MoveData {
@@ -102,14 +102,10 @@ impl MoveData {
         self.priority
     }
 
-    pub fn secondary_effect(&self) -> &SecondaryEffect {
+    pub fn secondary_effect(&self) -> &Option<SecondaryEffect> {
         &self.secondary_effect
     }
 
-    pub fn has_secondary_effect(&self) -> bool {
-        self.secondary_effect.effect_name() != &StringKey::empty()
-    }
-
     pub fn has_flag(&self, key: &StringKey) -> bool {
         self.flags.contains(key)
     }
diff --git a/src/static_data/moves/secondary_effect.rs b/src/static_data/moves/secondary_effect.rs
index a511a59..90588c9 100644
--- a/src/static_data/moves/secondary_effect.rs
+++ b/src/static_data/moves/secondary_effect.rs
@@ -16,13 +16,6 @@ pub struct SecondaryEffect {
 }
 
 impl SecondaryEffect {
-    pub fn empty() -> SecondaryEffect {
-        SecondaryEffect {
-            chance: 0.0,
-            effect_name: StringKey::empty(),
-            parameters: vec![],
-        }
-    }
     pub fn new(chance: f32, effect_name: StringKey, parameters: Vec<EffectParameter>) -> SecondaryEffect {
         SecondaryEffect {
             chance,
@@ -49,7 +42,7 @@ mod tests {
 
     #[test]
     fn create_secondary_effect() {
-        let empty = SecondaryEffect::empty();
+        let empty = SecondaryEffect::new(0.0, "".into(), vec![]);
         assert_approx_eq!(empty.chance(), 0.0);
         assert_eq!(empty.effect_name(), &"".into());
         assert_eq!(empty.parameters().len(), 0);
diff --git a/tests/common/library_loader.rs b/tests/common/library_loader.rs
index ea92d57..d3f8649 100644
--- a/tests/common/library_loader.rs
+++ b/tests/common/library_loader.rs
@@ -188,9 +188,13 @@ pub fn load_moves(path: &String, lib: &mut StaticData) {
                 }
             }
 
-            SecondaryEffect::new(chance, StringKey::new(v["name"].as_str().unwrap()), parameters)
+            Some(SecondaryEffect::new(
+                chance,
+                StringKey::new(v["name"].as_str().unwrap()),
+                parameters,
+            ))
         } else {
-            SecondaryEffect::empty()
+            None
         };
 
         let mut flags = HashSet::new();