diff --git a/Assets/Fantasy Skybox FREE/Panoramics/FS002/FS002_Night.mat b/Assets/Fantasy Skybox FREE/Panoramics/FS002/FS002_Night.mat
index 1753aa7d..3dde5691 100644
--- a/Assets/Fantasy Skybox FREE/Panoramics/FS002/FS002_Night.mat	
+++ b/Assets/Fantasy Skybox FREE/Panoramics/FS002/FS002_Night.mat	
@@ -78,7 +78,7 @@ Material:
     - _Mode: 0
     - _OcclusionStrength: 1
     - _Parallax: 0.02
-    - _Rotation: 6.6876717
+    - _Rotation: 7.162766
     - _SmoothnessTextureChannel: 0
     - _SpecularHighlights: 1
     - _SrcBlend: 1
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityMigrationHelper.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityMigrationHelper.cs
new file mode 100644
index 00000000..20fae4f1
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityMigrationHelper.cs
@@ -0,0 +1,52 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// ============================================================================
+// 5. EASY MIGRATION HELPER - Update Your Existing Components
+// ============================================================================
+
+/// <summary>
+/// Helper to easily convert your existing ability references
+/// Just change "BaseAbility" to "RuntimeAbilityInstance" in your existing scripts
+/// </summary>
+public static class AbilityMigrationHelper
+{
+    /// <summary>
+    /// Convert a BaseAbility to RuntimeAbilityInstance
+    /// </summary>
+    public static RuntimeAbilityInstance ToRuntime(this BaseAbility ability)
+    {
+        return new RuntimeAbilityInstance(ability);
+    }
+
+    /// <summary>
+    /// Create a modified version of an ability
+    /// </summary>
+    public static RuntimeAbilityInstance CreateModifiedVersion(BaseAbility baseAbility, params AbilityModifier[] modifiers)
+    {
+        var runtime = new RuntimeAbilityInstance(baseAbility);
+
+        foreach (var modifier in modifiers)
+        {
+            runtime.AddModifier(modifier);
+        }
+
+        return runtime;
+    }
+
+    /// <summary>
+    /// Create legendary version with special behaviors
+    /// </summary>
+    public static RuntimeAbilityInstance CreateLegendaryVersion(BaseAbility baseAbility, params RuntimeBehavior[] behaviors)
+    {
+        var runtime = new RuntimeAbilityInstance(baseAbility);
+
+        foreach (var behavior in behaviors)
+        {
+            runtime.AddBehavior(behavior);
+        }
+
+        return runtime;
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityMigrationHelper.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityMigrationHelper.cs.meta
new file mode 100644
index 00000000..9fd2322a
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityMigrationHelper.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityModifier.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityModifier.cs
new file mode 100644
index 00000000..9e87ae2f
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityModifier.cs
@@ -0,0 +1,60 @@
+// ============================================================================
+// 2. ABILITY MODIFIER SYSTEM
+// ============================================================================
+
+using UnityEngine;
+
+[System.Serializable]
+public class AbilityModifier
+{
+    [Header("Resource Cost Modifiers")]
+    public float manaCostMultiplier = 1f;
+    public float manaCostFlat = 0f;
+    public float healthCostMultiplier = 1f;
+    public float healthCostFlat = 0f;
+    public float classResourceCostMultiplier = 1f;
+    public float classResourceCostFlat = 0f;
+
+    [Header("Timing Modifiers")]
+    public float castTimeMultiplier = 1f;
+    public float cooldownMultiplier = 1f;
+
+    [Header("Effect Modifiers")]
+    public float damageMultiplier = 1f;
+    public float healingMultiplier = 1f;
+    public float durationMultiplier = 1f;
+    public float rangeMultiplier = 1f;
+
+    [Header("Meta Info")]
+    public string modifierName = "Unnamed Modifier";
+    public string description = "";
+    public float duration = -1f; // -1 = permanent
+
+    // Factory methods for common modifiers
+    public static AbilityModifier CreateDamageBoost(float multiplier, string name = "Damage Boost")
+    {
+        return new AbilityModifier
+        {
+            damageMultiplier = multiplier,
+            modifierName = name
+        };
+    }
+
+    public static AbilityModifier CreateCooldownReduction(float reductionPercent, string name = "Cooldown Reduction")
+    {
+        return new AbilityModifier
+        {
+            cooldownMultiplier = 1f - (reductionPercent / 100f),
+            modifierName = name
+        };
+    }
+
+    public static AbilityModifier CreateManaCostReduction(float reductionPercent, string name = "Mana Cost Reduction")
+    {
+        return new AbilityModifier
+        {
+            manaCostMultiplier = 1f - (reductionPercent / 100f),
+            modifierName = name
+        };
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityModifier.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityModifier.cs.meta
new file mode 100644
index 00000000..6433510b
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityModifier.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityUsageExamples.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityUsageExamples.cs
new file mode 100644
index 00000000..e6637caf
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityUsageExamples.cs
@@ -0,0 +1,59 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// ============================================================================
+// 6. USAGE EXAMPLES - How to Use in Your Existing Code
+// ============================================================================
+
+public class AbilityUsageExamples : MonoBehaviour
+{
+    [Header("Your Existing Abilities")]
+    public BaseAbility fireballAbility;
+    public BaseAbility healingAbility;
+
+    // These can now be RuntimeAbilityInstances!
+    private RuntimeAbilityInstance runtimeFireball;
+    private RuntimeAbilityInstance runtimeHealing;
+
+    private void Start()
+    {
+        // Convert your existing abilities
+        runtimeFireball = fireballAbility.ToRuntime();
+        runtimeHealing = healingAbility.ToRuntime();
+
+        // Example: Add legendary item effect
+        AddLegendaryFireballEffect();
+    }
+
+    private void AddLegendaryFireballEffect()
+    {
+        // This is how you'd handle your legendary item!
+        var explosionBehavior = new ExplodeOnHitBehavior
+        {
+            explosionRadius = 5f,
+            explosionDamage = 50f
+        };
+
+        runtimeFireball.AddBehavior(explosionBehavior);
+
+        // Also add a damage boost
+        var damageBoost = AbilityModifier.CreateDamageBoost(1.5f, "Legendary Damage");
+        runtimeFireball.AddModifier(damageBoost);
+    }
+
+    // Your existing ability usage code works exactly the same!
+    public void CastFireball()
+    {
+        var user = GetComponent<Taggable>();
+
+        // This works exactly like your old BaseAbility.Execute()
+        runtimeFireball.Execute(user);
+    }
+
+    public void CastFireballAtTarget(Transform target)
+    {
+        var user = GetComponent<Taggable>();
+        runtimeFireball.Execute(user, target);
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityUsageExamples.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityUsageExamples.cs.meta
new file mode 100644
index 00000000..37a37df9
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/AbilityUsageExamples.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions.meta
new file mode 100644
index 00000000..60f65cc0
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions.meta
@@ -0,0 +1,8 @@
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diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ChainLightningBehavior.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ChainLightningBehavior.cs
new file mode 100644
index 00000000..06e7178a
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ChainLightningBehavior.cs
@@ -0,0 +1,74 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+public class ChainLightningBehavior : RuntimeBehavior
+{
+    public int maxChains = 3;
+    public float chainRange = 8f;
+    public float damageMultiplier = 0.5f; // Each chain does 50% of original damage
+
+    public ChainLightningBehavior()
+    {
+        Trigger = BehaviorTrigger.OnHit;
+        BehaviorName = "Chain Lightning";
+    }
+
+    public override void Execute(RuntimeAbilityInstance ability, Taggable user, Transform target, Vector3 point)
+    {
+        if (target == null) return;
+
+        var currentTarget = target.GetComponent<Taggable>();
+        var chainedTargets = new List<Taggable> { currentTarget };
+
+        for (int i = 0; i < maxChains; i++)
+        {
+            var nextTarget = FindNextChainTarget(currentTarget.transform.position, chainedTargets);
+            if (nextTarget == null) break;
+
+            chainedTargets.Add(nextTarget);
+
+            // Apply reduced damage
+            var health = nextTarget.GetComponent<Health>();
+            if (health != null)
+            {
+                float chainDamage = CalculateChainDamage(ability, i + 1);
+                health.ChangeValue(-chainDamage);
+            }
+
+            currentTarget = nextTarget;
+        }
+    }
+
+    private Taggable FindNextChainTarget(Vector3 position, List<Taggable> excludeTargets)
+    {
+        var colliders = Physics.OverlapSphere(position, chainRange);
+
+        foreach (var collider in colliders)
+        {
+            var target = collider.GetComponent<Taggable>();
+            if (target != null && !excludeTargets.Contains(target))
+            {
+                return target;
+            }
+        }
+
+        return null;
+    }
+
+    private float CalculateChainDamage(RuntimeAbilityInstance ability, int chainNumber)
+    {
+        // This would need to be adapted to your damage system
+        // For now, just return a reduced amount
+        return 50f * Mathf.Pow(damageMultiplier, chainNumber);
+    }
+
+    public override RuntimeBehavior Clone()
+    {
+        return new ChainLightningBehavior
+        {
+            maxChains = this.maxChains,
+            chainRange = this.chainRange,
+            damageMultiplier = this.damageMultiplier
+        };
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ChainLightningBehavior.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ChainLightningBehavior.cs.meta
new file mode 100644
index 00000000..8311b6c8
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ChainLightningBehavior.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ExplodeOnHitBehavior.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ExplodeOnHitBehavior.cs
new file mode 100644
index 00000000..fa6dad15
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ExplodeOnHitBehavior.cs
@@ -0,0 +1,58 @@
+// ============================================================================
+// 4. COMMON RUNTIME BEHAVIORS - Your Legendary Item Effects!
+// ============================================================================
+
+using UnityEngine;
+
+public class ExplodeOnHitBehavior : RuntimeBehavior
+{
+    public GameObject explosionPrefab;
+    public float explosionRadius = 5f;
+    public float explosionDamage = 30f;
+    public LayerMask targetLayers = -1;
+
+    public ExplodeOnHitBehavior()
+    {
+        Trigger = BehaviorTrigger.OnHit;
+        BehaviorName = "Explode on Hit";
+    }
+
+    public override void Execute(RuntimeAbilityInstance ability, Taggable user, Transform target, Vector3 point)
+    {
+        Vector3 explosionPoint = target != null ? target.position : point;
+
+        // Spawn explosion visual if prefab exists
+        if (explosionPrefab != null)
+        {
+            Object.Instantiate(explosionPrefab, explosionPoint, Quaternion.identity);
+        }
+
+        // Find targets in explosion radius
+        var colliders = Physics.OverlapSphere(explosionPoint, explosionRadius, targetLayers);
+
+        foreach (var collider in colliders)
+        {
+            var explosionTarget = collider.GetComponent<Taggable>();
+            if (explosionTarget != null && explosionTarget != user)
+            {
+                // Apply explosion damage
+                var health = explosionTarget.GetComponent<Health>();
+                if (health != null)
+                {
+                    health.ChangeValue(-explosionDamage);
+                }
+            }
+        }
+    }
+
+    public override RuntimeBehavior Clone()
+    {
+        return new ExplodeOnHitBehavior
+        {
+            explosionPrefab = this.explosionPrefab,
+            explosionRadius = this.explosionRadius,
+            explosionDamage = this.explosionDamage,
+            targetLayers = this.targetLayers
+        };
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ExplodeOnHitBehavior.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ExplodeOnHitBehavior.cs.meta
new file mode 100644
index 00000000..c042a187
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/ExplodeOnHitBehavior.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/LifeStealBehavior.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/LifeStealBehavior.cs
new file mode 100644
index 00000000..a905bc9e
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/LifeStealBehavior.cs
@@ -0,0 +1,34 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class LifeStealBehavior : RuntimeBehavior
+{
+    public float lifeStealPercent = 0.15f; // 15% life steal
+
+    public LifeStealBehavior()
+    {
+        Trigger = BehaviorTrigger.OnHit;
+        BehaviorName = "Life Steal";
+    }
+
+    public override void Execute(RuntimeAbilityInstance ability, Taggable user, Transform target, Vector3 point)
+    {
+        // This would need to track the damage dealt to calculate life steal
+        // For now, just heal a fixed amount
+        var userHealth = user.GetComponent<Health>();
+        if (userHealth != null)
+        {
+            float healAmount = 20f * lifeStealPercent; // Placeholder calculation
+            userHealth.ChangeValue(healAmount);
+        }
+    }
+
+    public override RuntimeBehavior Clone()
+    {
+        return new LifeStealBehavior
+        {
+            lifeStealPercent = this.lifeStealPercent
+        };
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/LifeStealBehavior.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/LifeStealBehavior.cs.meta
new file mode 100644
index 00000000..479d7e4c
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+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/Extensions/LifeStealBehavior.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeAbilityInstance.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeAbilityInstance.cs
new file mode 100644
index 00000000..d1586ed2
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeAbilityInstance.cs
@@ -0,0 +1,308 @@
+// ============================================================================
+// RUNTIME ABILITY WRAPPER - DROP-IN REPLACEMENT FOR BaseAbility
+// ============================================================================
+
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+// ============================================================================
+// 1. RUNTIME ABILITY INSTANCE - Wraps Your Existing BaseAbility
+// ============================================================================
+
+/// <summary>
+/// Runtime wrapper for BaseAbility that adds modifiers and behaviors
+/// Can be used anywhere you currently use BaseAbility references
+/// </summary>
+public class RuntimeAbilityInstance
+{
+    // ========================================================================
+    // CORE DATA - Wraps your existing ScriptableObject
+    // ========================================================================
+
+    [SerializeField] private BaseAbility sourceAbility;
+    private List<AbilityModifier> activeModifiers = new List<AbilityModifier>();
+    private List<RuntimeBehavior> runtimeBehaviors = new List<RuntimeBehavior>();
+
+    // Runtime state
+    private float lastUsedTime;
+    private int currentCharges;
+
+    // ========================================================================
+    // CONSTRUCTOR
+    // ========================================================================
+
+    public RuntimeAbilityInstance(BaseAbility source)
+    {
+        sourceAbility = source;
+        currentCharges = GetMaxCharges(); // In case you add charges later
+        RecalculateModifiedValues();
+    }
+
+    // ========================================================================
+    // PROPERTIES - Direct access to original + modified values
+    // ========================================================================
+
+    // Original values (unchanged)
+    public BaseAbility SourceAbility => sourceAbility;
+    public string displayName => sourceAbility.displayName;
+    public Sprite Icon => sourceAbility.Icon;
+    public List<TargetTag> targettingTags => sourceAbility.targettingTags;
+    public List<GameTag> tags => sourceAbility.tags;
+    public List<BaseEffect> abilityEffects => sourceAbility.abilityEffects;
+    public bool castableWhileMoving => sourceAbility.castableWhileMoving;
+    public AbilityAnimationType animationType => sourceAbility.animationType;
+
+    // Modified values (affected by modifiers)
+    public float manaCost { get; private set; }
+    public float healthCost { get; private set; }
+    public float classResourceCost { get; private set; }
+    public float spiritPowerReserveCost { get; private set; }
+    public float percentMaxManaCost { get; private set; }
+    public float percentMaxHealthCost { get; private set; }
+    public float castTime { get; private set; }
+    public float cooldown { get; private set; }
+
+    // Runtime state properties
+    public float LastUsedTime => lastUsedTime;
+    public bool IsOnCooldown => Time.time < lastUsedTime + cooldown;
+    public float CooldownRemaining => Mathf.Max(0f, (lastUsedTime + cooldown) - Time.time);
+    public List<AbilityModifier> ActiveModifiers => new List<AbilityModifier>(activeModifiers);
+    public List<RuntimeBehavior> RuntimeBehaviors => new List<RuntimeBehavior>(runtimeBehaviors);
+
+    // ========================================================================
+    // EXECUTION METHODS - Same signature as your BaseAbility
+    // ========================================================================
+
+    public virtual void Execute(Taggable user)
+    {
+        if (!CanExecute(user)) return;
+
+        // Execute pre-cast behaviors
+        ExecuteBehaviors(BehaviorTrigger.PreCast, user, null, Vector3.zero);
+
+        // Execute original ability
+        sourceAbility.Execute(user);
+
+        // Execute post-cast behaviors  
+        ExecuteBehaviors(BehaviorTrigger.PostCast, user, null, Vector3.zero);
+
+        // Update runtime state
+        lastUsedTime = Time.time;
+    }
+
+    public virtual void Execute(Taggable user, Vector3 point)
+    {
+        if (!CanExecute(user)) return;
+
+        ExecuteBehaviors(BehaviorTrigger.PreCast, user, null, point);
+        sourceAbility.Execute(user, point);
+        ExecuteBehaviors(BehaviorTrigger.PostCast, user, null, point);
+
+        lastUsedTime = Time.time;
+    }
+
+    public virtual void Execute(Taggable user, Transform target)
+    {
+        if (!CanExecute(user)) return;
+
+        ExecuteBehaviors(BehaviorTrigger.PreCast, user, target, target.position);
+        sourceAbility.Execute(user, target);
+        ExecuteBehaviors(BehaviorTrigger.PostCast, user, target, target.position);
+
+        lastUsedTime = Time.time;
+    }
+
+    // ========================================================================
+    // ABILITY STATE CHECKS
+    // ========================================================================
+
+    public bool CanExecute(Taggable user)
+    {
+        // Check cooldown
+        if (IsOnCooldown) return false;
+
+        // Check resources using modified costs
+        return CanAffordResources(user);
+    }
+
+    private bool CanAffordResources(Taggable user)
+    {
+        // Use the modified costs, not original
+        var userMana = user.GetComponent<Mana>();
+        if (userMana != null)
+        {
+            float finalManaCost = manaCost + userMana.GetMaxValue() * percentMaxManaCost;
+            if (!userMana.EnoughMana(finalManaCost)) return false;
+        }
+
+        var userHealth = user.GetComponent<Health>();
+        if (userHealth != null)
+        {
+            float finalHealthCost = healthCost + userHealth.GetMaxValue() * percentMaxHealthCost;
+            if (userHealth.GetCurrentValue() <= finalHealthCost) return false;
+        }
+
+        var userClassResource = user.GetComponent<ClassResource>();
+        if (userClassResource != null && classResourceCost > 0)
+        {
+            if (userClassResource.GetCurrentValue() < classResourceCost) return false;
+        }
+
+        return true;
+    }
+
+    public float GetFinalManaCost(Mana userMana)
+    {
+        return manaCost + userMana.GetMaxValue() * percentMaxManaCost;
+    }
+
+    public float GetFinalHealthCost(Health userHealth)
+    {
+        return healthCost + userHealth.GetMaxValue() * percentMaxHealthCost;
+    }
+
+    // ========================================================================
+    // MODIFIER SYSTEM
+    // ========================================================================
+
+    public void AddModifier(AbilityModifier modifier)
+    {
+        activeModifiers.Add(modifier);
+        RecalculateModifiedValues();
+    }
+
+    public void RemoveModifier(AbilityModifier modifier)
+    {
+        activeModifiers.Remove(modifier);
+        RecalculateModifiedValues();
+    }
+
+    public void RemoveAllModifiers()
+    {
+        activeModifiers.Clear();
+        RecalculateModifiedValues();
+    }
+
+    private void RecalculateModifiedValues()
+    {
+        // Start with original values
+        manaCost = sourceAbility.manaCost;
+        healthCost = sourceAbility.healthCost;
+        classResourceCost = sourceAbility.classResourceCost;
+        spiritPowerReserveCost = sourceAbility.spiritPowerReserveCost;
+        percentMaxManaCost = sourceAbility.percentMaxManaCost;
+        percentMaxHealthCost = sourceAbility.percentMaxHealthCost;
+        castTime = sourceAbility.castTime;
+        cooldown = sourceAbility.cooldown;
+
+        // Apply all modifiers
+        foreach (var modifier in activeModifiers)
+        {
+            ApplyModifier(modifier);
+        }
+    }
+
+    private void ApplyModifier(AbilityModifier modifier)
+    {
+        // Resource cost modifiers
+        manaCost = manaCost * modifier.manaCostMultiplier + modifier.manaCostFlat;
+        healthCost = healthCost * modifier.healthCostMultiplier + modifier.healthCostFlat;
+        classResourceCost = classResourceCost * modifier.classResourceCostMultiplier + modifier.classResourceCostFlat;
+
+        // Timing modifiers  
+        castTime *= modifier.castTimeMultiplier;
+        cooldown *= modifier.cooldownMultiplier;
+
+        // Ensure values don't go negative
+        manaCost = Mathf.Max(0f, manaCost);
+        healthCost = Mathf.Max(0f, healthCost);
+        classResourceCost = Mathf.Max(0f, classResourceCost);
+        castTime = Mathf.Max(0f, castTime);
+        cooldown = Mathf.Max(0f, cooldown);
+    }
+
+    // ========================================================================
+    // RUNTIME BEHAVIOR SYSTEM
+    // ========================================================================
+
+    public void AddBehavior(RuntimeBehavior behavior)
+    {
+        runtimeBehaviors.Add(behavior);
+    }
+
+    public void RemoveBehavior(RuntimeBehavior behavior)
+    {
+        runtimeBehaviors.Remove(behavior);
+    }
+
+    public T GetBehavior<T>() where T : RuntimeBehavior
+    {
+        return runtimeBehaviors.Find(b => b is T) as T;
+    }
+
+    public void RemoveBehavior<T>() where T : RuntimeBehavior
+    {
+        for (int i = runtimeBehaviors.Count - 1; i >= 0; i--)
+        {
+            if (runtimeBehaviors[i] is T)
+            {
+                runtimeBehaviors.RemoveAt(i);
+            }
+        }
+    }
+
+    private void ExecuteBehaviors(BehaviorTrigger trigger, Taggable user, Transform target, Vector3 point)
+    {
+        foreach (var behavior in runtimeBehaviors)
+        {
+            if (behavior.Trigger == trigger)
+            {
+                behavior.Execute(this, user, target, point);
+            }
+        }
+    }
+
+    // ========================================================================
+    // UTILITY METHODS
+    // ========================================================================
+
+    public RuntimeAbilityInstance Clone()
+    {
+        var clone = new RuntimeAbilityInstance(sourceAbility);
+
+        // Copy modifiers
+        foreach (var modifier in activeModifiers)
+        {
+            clone.AddModifier(modifier);
+        }
+
+        // Copy behaviors
+        foreach (var behavior in runtimeBehaviors)
+        {
+            clone.AddBehavior(behavior.Clone());
+        }
+
+        return clone;
+    }
+
+    private int GetMaxCharges()
+    {
+        // Future: add charge system
+        return 1;
+    }
+
+    // ========================================================================
+    // IMPLICIT CONVERSION - Makes it work seamlessly
+    // ========================================================================
+
+    public static implicit operator BaseAbility(RuntimeAbilityInstance instance)
+    {
+        return instance.sourceAbility;
+    }
+
+    public static implicit operator RuntimeAbilityInstance(BaseAbility ability)
+    {
+        return new RuntimeAbilityInstance(ability);
+    }
+}
\ No newline at end of file
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeAbilityInstance.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeAbilityInstance.cs.meta
new file mode 100644
index 00000000..99b31578
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeAbilityInstance.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 63ca0a6b1e4e799418c4e8dd0cf4ace5
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeBehavior.cs b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeBehavior.cs
new file mode 100644
index 00000000..7e5f2d16
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeBehavior.cs
@@ -0,0 +1,19 @@
+using UnityEngine;
+
+public enum BehaviorTrigger
+{
+    PreCast,    // Before ability executes
+    PostCast,   // After ability executes
+    OnHit,      // When ability hits target
+    OnKill,     // When ability kills target
+    OnCrit      // When ability crits
+}
+
+public abstract class RuntimeBehavior
+{
+    public BehaviorTrigger Trigger { get; set; }
+    public string BehaviorName { get; set; }
+
+    public abstract void Execute(RuntimeAbilityInstance ability, Taggable user, Transform target, Vector3 point);
+    public abstract RuntimeBehavior Clone();
+}
diff --git a/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeBehavior.cs.meta b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeBehavior.cs.meta
new file mode 100644
index 00000000..421cd5f0
--- /dev/null
+++ b/Assets/Scripts/AbilitySystem/AbilityInstance/RuntimeBehavior.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0a8f3389f97c1f343ba02dc9b50a1848
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: