diff --git a/CInterface/Library/AttackData.cpp b/CInterface/Library/AttackData.cpp
index f83ba6a..02d1e21 100644
--- a/CInterface/Library/AttackData.cpp
+++ b/CInterface/Library/AttackData.cpp
@@ -5,14 +5,15 @@ using namespace CreatureLib::Library;
 export uint8_t CreatureLib_AttackData_Construct(AttackData*& out, const char* name, uint8_t type,
                                                 AttackCategory category, uint8_t power, uint8_t accuracy,
                                                 uint8_t baseUsage, AttackTarget target, int8_t priority,
-                                                float effectChance, const char* effectName, void* effectParameters[],
-                                                size_t effectParameterCount, const char* flags[], size_t flagsCount) {
+                                                float effectChance, const char* effectName,
+                                                EffectParameter* effectParameters[], size_t effectParameterCount,
+                                                const char* flags[], size_t flagsCount) {
     Try({
         std::unordered_set<uint32_t> conversedFlags(flagsCount);
         for (size_t i = 0; i < flagsCount; i++) {
             conversedFlags.insert(ConstString::GetHash(flags[i]));
         }
-        Arbutils::Collections::List<void*> effectParameterList(effectParameterCount);
+        Arbutils::Collections::List<EffectParameter*> effectParameterList(effectParameterCount);
         for (size_t i = 0; i < effectParameterCount; i++) {
             effectParameterList[i] = effectParameters[i];
         }
diff --git a/src/Battling/ScriptHandling/Script.hpp b/src/Battling/ScriptHandling/Script.hpp
index d9025fe..c2aa372 100644
--- a/src/Battling/ScriptHandling/Script.hpp
+++ b/src/Battling/ScriptHandling/Script.hpp
@@ -3,9 +3,7 @@
 
 #include <Arbutils/Collections/List.hpp>
 #include <Arbutils/ConstString.hpp>
-#include <string>
-#include <utility>
-#include <vector>
+#include "../../Library/EffectParameter.hpp"
 
 using ConstString = Arbutils::CaseInsensitiveConstString;
 
@@ -25,7 +23,8 @@ namespace CreatureLib::Battling {
 
         virtual const ConstString& GetName() const noexcept = 0;
 
-        virtual void OnInitialize(const Arbutils::Collections::List<void*>& parameters){};
+        virtual void
+        OnInitialize(const Arbutils::Collections::List<CreatureLib::Library::EffectParameter*>& parameters){};
         virtual void OnBeforeTurn(const BaseTurnChoice* choice){};
 
         virtual void ChangeAttack(AttackTurnChoice* choice, ConstString* outAttack){};
diff --git a/src/Library/Attacks/SecondaryEffect.hpp b/src/Library/Attacks/SecondaryEffect.hpp
index 44bbf28..55f8732 100644
--- a/src/Library/Attacks/SecondaryEffect.hpp
+++ b/src/Library/Attacks/SecondaryEffect.hpp
@@ -4,6 +4,7 @@
 #include <Arbutils/Collections/List.hpp>
 #include <Arbutils/ConstString.hpp>
 #include <any>
+#include "../EffectParameter.hpp"
 
 using namespace Arbutils::Collections;
 namespace CreatureLib::Library {
@@ -11,17 +12,23 @@ namespace CreatureLib::Library {
     private:
         float _chance;
         Arbutils::CaseInsensitiveConstString _effectName;
-        List<void*> _parameters;
+        List<EffectParameter*> _parameters;
 
     public:
         SecondaryEffect() noexcept : _chance(0), _effectName(Arbutils::CaseInsensitiveConstString("")) {}
         SecondaryEffect(float chance, const Arbutils::CaseInsensitiveConstString& effectName,
-                        const List<void*>& parameters) noexcept
+                        const List<EffectParameter*>& parameters) noexcept
             : _chance(chance), _effectName(effectName), _parameters(parameters) {}
 
+        ~SecondaryEffect() {
+            for (auto p : _parameters) {
+                delete p;
+            }
+        }
+
         constexpr float GetChance() const noexcept { return _chance; }
         constexpr const Arbutils::CaseInsensitiveConstString& GetEffectName() const noexcept { return _effectName; }
-        const List<void*>& GetParameters() const noexcept { return _parameters; }
+        const List<EffectParameter*>& GetParameters() const noexcept { return _parameters; }
     };
 }
 
diff --git a/src/Library/EffectParameter.hpp b/src/Library/EffectParameter.hpp
new file mode 100644
index 0000000..41ce087
--- /dev/null
+++ b/src/Library/EffectParameter.hpp
@@ -0,0 +1,53 @@
+#ifndef CREATURELIB_EFFECTPARAMETER_HPP
+#define CREATURELIB_EFFECTPARAMETER_HPP
+#include <Arbutils/Enum.hpp>
+#include <cstring>
+#include "Exceptions/CreatureException.hpp"
+
+namespace CreatureLib::Library {
+    ENUM(EffectParameterType, uint8_t, None, Bool, Int, String);
+
+    class EffectParameter {
+    private:
+        EffectParameterType _type = EffectParameterType::None;
+        void* _val;
+
+    public:
+        EffectParameter() : _type(EffectParameterType::None), _val(nullptr){};
+        EffectParameter(bool b) : _type(EffectParameterType::Bool), _val((void*)b){};
+        EffectParameter(int64_t i) : _type(EffectParameterType::Int), _val((void*)i){};
+        EffectParameter(const std::string& s) : _type(EffectParameterType::String), _val(new char[s.size() + 1]) {
+            strncpy((char*)_val, s.c_str(), s.size() + 1);
+        };
+        EffectParameter(const EffectParameter& other) = delete;
+        EffectParameter& operator=(const EffectParameter& other) = delete;
+
+        EffectParameterType GetType() const noexcept { return _type; }
+        bool AsBool() const {
+            if (_type != EffectParameterType::Bool) {
+                std::stringstream ss;
+                ss << "Cast effect parameter to bool, but was " << EffectParameterTypeHelper::ToString(_type);
+                throw CreatureException(ss.str());
+            }
+            return (bool)_val;
+        }
+        int64_t AsInt() const {
+            if (_type != EffectParameterType::Int) {
+                std::stringstream ss;
+                ss << "Cast effect parameter to int, but was " << EffectParameterTypeHelper::ToString(_type);
+                throw CreatureException(ss.str());
+            }
+            return reinterpret_cast<int64_t>(_val);
+        }
+        const char* AsString() const {
+            if (_type != EffectParameterType::String) {
+                std::stringstream ss;
+                ss << "Cast effect parameter to string, but was " << EffectParameterTypeHelper::ToString(_type);
+                throw CreatureException(ss.str());
+            }
+            return (char*)_val;
+        }
+    };
+}
+
+#endif // CREATURELIB_EFFECTPARAMETER_HPP