add example Effect and EnemyAttributes assets

Assets/Scriptables.meta

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Assets/Scriptables/EnemyAttributes.asset

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+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &11400000
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+  m_Script: {fileID: 11500000, guid: c5304ff6dfe84844887d751cee48606a, type: 3}
+  m_Name: EnemyAttributes
+  m_EditorClassIdentifier: 
+  STR: {fileID: 0}
+  CON: {fileID: 0}
+  SPD: {fileID: 0}
+  RNG: {fileID: 0}
+  MND: {fileID: 0}

Assets/Scriptables/EnemyAttributes.asset.meta

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Assets/Scriptables/StatEffect.asset

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+  m_Script: {fileID: 11500000, guid: 494a21c06960ec442a7a6806f8aefedb, type: 3}
+  m_Name: StatEffect
+  m_EditorClassIdentifier: 

Assets/Scriptables/StatEffect.asset.meta

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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.

Assets/Scripts/EffectSO.cs

@@ -6,16 +6,16 @@ public class EffectSO : ScriptableObject
     /// <summary>
     /// Additive change applied before multiplicative scaling.
     /// </summary>
-    public long Base { get; private set; }
+    public long Base;
     /// <summary>
     /// Multiplicative scaling in units of hundredth of a percent.
     /// E.g., 625 permyriad is 6.25%.
     /// </summary>
-    public long Permyriad { get; private set; }
+    public long Permyriad;
     /// <summary>
     /// Additive change applied after multiplicative scaling.
     /// </summary>
-    public long Flat { get; private set; }
+    public long Flat;
 
     /// <summary>
     /// Create a new attribute effect instance.

Assets/Scripts/EnemyAttributesSO.cs

@@ -1,5 +1,6 @@
 using UnityEngine;
 
+[CreateAssetMenu(fileName = "EnemyAttributes", menuName = "Enemy Attributes")]
 public class EnemyAttributesSO : ScriptableObject
 {
     [SerializeField] private Attribute STR;
@@ -7,6 +8,8 @@ public class EnemyAttributesSO : ScriptableObject
     [SerializeField] private Attribute SPD;
     [SerializeField] private Attribute RNG;
     [SerializeField] private Attribute MND;
+    public long XP { get; private set; }
+    public long Threat { get; private set; }
 
     public static EnemyAttributesSO New()
     {

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>();
+        var attr = new Attribute(startStat);
-        attr.Base = startStat;
         var effect = EffectSO.New(baseBonus, permyriadBonus, flatBonus);
         return attr.Calc(effect);
     }