diff --git a/src/ScriptResolving/AngelScript/AngelScriptScript.hpp b/src/ScriptResolving/AngelScript/AngelScriptScript.hpp
index 49eff8a..9a6e77f 100644
--- a/src/ScriptResolving/AngelScript/AngelScriptScript.hpp
+++ b/src/ScriptResolving/AngelScript/AngelScriptScript.hpp
@@ -4,6 +4,7 @@
 #define ANGELSCRIPT_DLL_LIBRARY_IMPORT
 #include <CreatureLib/Library/Exceptions/NotImplementedException.hpp>
 #include <angelscript.h>
+#include <cstdint>
 #include "../../../extern/angelscript_addons/scriptarray/scriptarray.h"
 #include "../../Battling/PkmnScript.hpp"
 #include "AngelScriptTypeInfo.hpp"
@@ -167,6 +168,16 @@ public:
         })
     }
 
+    void ChangeEffectiveness(CreatureLib::Battling::ExecutingAttack* attack, CreatureLib::Battling::Creature* target,
+                             uint8_t hitNumber, float* effectiveness) override {
+        CALL_HOOK(ChangeEffectiveness, {
+            ctx->SetArgObject(0, (void*)attack);
+            ctx->SetArgObject(1, (void*)target);
+            ctx->SetArgByte(2, hitNumber);
+            ctx->SetArgAddress(3, effectiveness);
+        })
+    }
+
     void PreventSecondaryEffects(const CreatureLib::Battling::ExecutingAttack* attack,
                                  CreatureLib::Battling::Creature* target, uint8_t hitNumber, bool* outResult) override {
         CALL_HOOK(PreventSecondaryEffects, {
diff --git a/src/ScriptResolving/AngelScript/AngelScriptTypeInfo.hpp b/src/ScriptResolving/AngelScript/AngelScriptTypeInfo.hpp
index cadab39..1022636 100644
--- a/src/ScriptResolving/AngelScript/AngelScriptTypeInfo.hpp
+++ b/src/ScriptResolving/AngelScript/AngelScriptTypeInfo.hpp
@@ -45,9 +45,7 @@ public:
 
     const ConstString& GetName() const noexcept { return _name; }
 
-    const char* GetDecl(){
-        return _type->GetName();
-    }
+    const char* GetDecl() { return _type->GetName(); }
 
     asIScriptFunction* GetFunction(const ConstString& functionName) {
         asIScriptFunction* func;
@@ -94,6 +92,9 @@ public:
     SCRIPT_HOOK_FUNCTION(OnAttackMiss, "void OnAttackMiss(ExecutingMove@ attack, Pokemon@ target)");
     SCRIPT_HOOK_FUNCTION(ChangeAttackType,
                          "void ChangeAttackType(ExecutingMove@ attack, Pokemon@ target, uint8 hit, uint8& outType)");
+    SCRIPT_HOOK_FUNCTION(
+        ChangeEffectiveness,
+        "void ChangeEffectiveness(ExecutingMove@ attack, Pokemon@ target, uint8 hit, float& effectiveness)");
     SCRIPT_HOOK_FUNCTION(
         PreventSecondaryEffects,
         "void PreventSecondaryEffects(ExecutingMove@ attack, Pokemon@ target, uint8 hit, bool& outResult)");
diff --git a/src/ScriptResolving/AngelScript/TypeRegistry/BasicScriptClass.cpp b/src/ScriptResolving/AngelScript/TypeRegistry/BasicScriptClass.cpp
index 42aa0b2..4c147a8 100644
--- a/src/ScriptResolving/AngelScript/TypeRegistry/BasicScriptClass.cpp
+++ b/src/ScriptResolving/AngelScript/TypeRegistry/BasicScriptClass.cpp
@@ -18,6 +18,7 @@ shared abstract class PkmnScript {
     void IsInvulnerable(ExecutingMove@ attack, Pokemon@ target, bool& result){};
     void OnAttackMiss(ExecutingMove@ attack, Pokemon@ target){};
     void ChangeAttackType(ExecutingMove@ attack, Pokemon@ target, uint8 hit, uint8& outType){};
+    void ChangeEffectiveness(ExecutingMove@ attack, Pokemon@ target, uint8 hit, float& effectiveness){};
     void PreventSecondaryEffects(ExecutingMove@ attack, Pokemon@ target, uint8 hit, bool& outResult){};
     void OnSecondaryEffect(ExecutingMove@ attack, Pokemon@ target, uint8 hit){};
     void OnAfterHits(ExecutingMove@ attack, Pokemon@ target){};
diff --git a/tests/ScriptTests/BaseScriptClassTests.cpp b/tests/ScriptTests/BaseScriptClassTests.cpp
index 6ee5e4b..d484a0f 100644
--- a/tests/ScriptTests/BaseScriptClassTests.cpp
+++ b/tests/ScriptTests/BaseScriptClassTests.cpp
@@ -58,6 +58,9 @@ void StopBeforeAttack(ExecutingMove@ attack, bool& result) override{
     AS_CLASS(
         ChangeAttackTypeScript,
         R"(void ChangeAttackType(ExecutingMove@ attack, Pokemon@ target, uint8 hit, uint8& outType) override{outType = 1; };)"),
+    AS_CLASS(
+        ChangeEffectivenessScript,
+        R"(void ChangeEffectiveness(ExecutingMove@ attack, Pokemon@ target, uint8 hit, float& eff) override{eff = 0.75; };)"),
     AS_CLASS(
         PreventSecondaryEffectsScript,
         R"(void PreventSecondaryEffects(ExecutingMove@ attack, Pokemon@ target, uint8 hit, bool& result) override{ result = !result; })"),
@@ -271,6 +274,17 @@ TEST_CASE("Invoke ChangeAttackType script function") {
     delete script;
 }
 
+TEST_CASE("Invoke ChangeEffectiveness script function") {
+    auto mainLib = TestLibrary::GetLibrary();
+    auto script = GetScript(mainLib, "ChangeEffectivenessScript"_cnc);
+    REQUIRE(script != nullptr);
+    float b = 0;
+    script->ChangeEffectiveness(nullptr, nullptr, 0, &b);
+    REQUIRE(b == Approx(0.75));
+
+    delete script;
+}
+
 TEST_CASE("Invoke PreventSecondaryEffects script function") {
     auto mainLib = TestLibrary::GetLibrary();
     auto script = GetScript(mainLib, "PreventSecondaryEffectsScript"_cnc);