diff --git a/Assets/Scripts/Attribute.cs b/Assets/Scripts/Attribute.cs
index 222652f..6c9a430 100644
--- a/Assets/Scripts/Attribute.cs
+++ b/Assets/Scripts/Attribute.cs
@@ -1,10 +1,14 @@
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
-public class Attribute : ScriptableObject
+[Serializable]
+public struct Attribute
 {
-    public long Base { get; set; }
+    public long Base;
+
+    public Attribute(long stat) { Base = stat; }
 
     /// <summary>
     /// Calculates the stat value with accumulated buff and debuff modifiers.
diff --git a/Assets/Tests/AttributeTest.cs b/Assets/Tests/AttributeTest.cs
index e240b88..bfb95d4 100644
--- a/Assets/Tests/AttributeTest.cs
+++ b/Assets/Tests/AttributeTest.cs
@@ -17,8 +17,7 @@ public class AttributeTest
     [TestCase(1000000, 0, -20000, 0, ExpectedResult = 0)]
     public long Value(long startStat, long baseBonus, long permyriadBonus, long flatBonus)
     {
-        var attr = ScriptableObject.CreateInstance<Attribute>();
-        attr.Base = startStat;
+        var attr = new Attribute(startStat);
         var effect = EffectSO.New(baseBonus, permyriadBonus, flatBonus);
         return attr.Calc(effect);
     }