diff --git a/gen_7_scripts/src/moves/struggle.rs b/gen_7_scripts/src/moves/struggle.rs
index d1058aa..f087e7a 100644
--- a/gen_7_scripts/src/moves/struggle.rs
+++ b/gen_7_scripts/src/moves/struggle.rs
@@ -55,7 +55,8 @@ impl Script for Struggle {
         if damage == 0 {
             damage = 1
         }
-        mv.user().damage(damage, DamageSource::Struggle)?;
+        mv.user()
+            .damage(damage, DamageSource::Struggle, Default::default())?;
         Ok(())
     }
 
diff --git a/pkmn_lib_interface/Cargo.toml b/pkmn_lib_interface/Cargo.toml
index 7095c68..6d9ed6a 100755
--- a/pkmn_lib_interface/Cargo.toml
+++ b/pkmn_lib_interface/Cargo.toml
@@ -15,4 +15,5 @@ paste = { version = "1.0.7" }
 hashbrown = { version = "0.13.2" }
 dlmalloc = { version = "0.2.4", features = ["global"] }
 mockall = { version = "0.11.2", optional = true, features = ["nightly"] }
-num-traits = { version = "0.2", default-features = false }
\ No newline at end of file
+num-traits = { version = "0.2", default-features = false }
+uuid = { version = "1.3.4", default-features = false }
\ No newline at end of file
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/mod.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/mod.rs
index dfd91d3..84f16d7 100755
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/mod.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/mod.rs
@@ -25,3 +25,20 @@ pub use pokemon::*;
 pub use statistic_set::*;
 pub use turn_choices::*;
 pub use with_volatile::*;
+
+#[derive(Default, Copy, Clone)]
+pub struct EventBatchId {
+    id: uuid::Uuid,
+}
+
+impl EventBatchId {
+    pub fn as_u64_pair(&self) -> (u64, u64) {
+        self.id.as_u64_pair()
+    }
+
+    pub fn from_u64_pair(a: u64, b: u64) -> Self {
+        Self {
+            id: uuid::Uuid::from_u64_pair(a, b),
+        }
+    }
+}
\ No newline at end of file
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs
index 06dc2fd..754495b 100755
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs
@@ -1,7 +1,7 @@
 use crate::app_interface::{
-    Ability, AbilityIndex, Battle, BattleSide, ClampedStatisticSet, DynamicLibrary, Form, Gender,
-    Item, LearnedMove, LevelInt, Nature, Species, Statistic, StatisticSet, TypeIdentifier,
-    WithVolatile,
+    Ability, AbilityIndex, Battle, BattleSide, ClampedStatisticSet, DynamicLibrary, EventBatchId,
+    Form, Gender, Item, LearnedMove, LevelInt, Nature, Species, Statistic, StatisticSet,
+    TypeIdentifier, WithVolatile,
 };
 use crate::handling::Script;
 use alloc::boxed::Box;
@@ -65,7 +65,12 @@ pub trait PokemonTrait: WithVolatile {
     fn change_species(&self, species: Species, form: Form);
     fn change_form(&self, form: Form);
     fn is_fainted(&self) -> PkmnResult<bool>;
-    fn damage(&self, damage: u32, source: DamageSource) -> PkmnResult<()>;
+    fn damage(
+        &self,
+        damage: u32,
+        source: DamageSource,
+        event_batch_id: EventBatchId,
+    ) -> PkmnResult<()>;
     fn heal(&self, amount: u32, allow_revive: bool) -> PkmnResult<bool>;
     fn set_weight(&self, weight: f32);
     fn clear_status(&self);
@@ -95,8 +100,8 @@ mod implementation {
 
     use crate::app_interface::dynamic_data::dynamic_library::DynamicLibraryImpl;
     use crate::app_interface::{
-        AbilityImpl, BattleImpl, FormImpl, ItemImpl, LearnedMoveImpl, NatureImpl, SpeciesImpl,
-        StatisticSetImpl,
+        AbilityImpl, BattleImpl, EventBatchId, FormImpl, ItemImpl, LearnedMoveImpl, NatureImpl,
+        SpeciesImpl, StatisticSetImpl,
     };
     use crate::handling::cached_value::CachedValue;
     use crate::handling::wasm_result::WasmResult;
@@ -333,8 +338,23 @@ mod implementation {
         fn is_fainted(&self) -> PkmnResult<bool> {
             Ok(self.current_health()? == 0)
         }
-        fn damage(&self, damage: u32, source: DamageSource) -> PkmnResult<()> {
-            unsafe { pokemon_damage(self.inner.reference, damage, source).as_res() }
+        fn damage(
+            &self,
+            damage: u32,
+            source: DamageSource,
+            evt_batch_id: EventBatchId,
+        ) -> PkmnResult<()> {
+            let evt_batch_id = evt_batch_id.as_u64_pair();
+            unsafe {
+                pokemon_damage(
+                    self.inner.reference,
+                    damage,
+                    source,
+                    evt_batch_id.0,
+                    evt_batch_id.1,
+                )
+                .as_res()
+            }
         }
 
         fn heal(&self, amount: u32, allow_revive: bool) -> PkmnResult<bool> {
@@ -608,6 +628,8 @@ mod implementation {
             r: ExternRef<PokemonImpl>,
             damage: u32,
             source: DamageSource,
+            evt_batch_id_1: u64,
+            evt_batch_id_2: u64,
         ) -> WasmResult<()>;
         fn pokemon_heal(
             r: ExternRef<PokemonImpl>,
@@ -688,7 +710,7 @@ mockall::mock!(
         fn change_species(&self, species: Species, form: Form);
         fn change_form(&self, form: Form);
         fn is_fainted(&self) -> PkmnResult<bool>;
-        fn damage(&self, damage: u32, source: DamageSource) -> PkmnResult<()>;
+        fn damage(&self, damage: u32, source: DamageSource, evt_batch_id: EventBatchId) -> PkmnResult<()>;
         fn heal(&self, amount: u32, allow_revive: bool) -> PkmnResult<bool>;
         fn set_weight(&self, weight: f32);
         fn clear_status(&self);