diff --git a/Assets/Scriptables.meta b/Assets/Scriptables.meta
new file mode 100644
index 0000000..94a9442
--- /dev/null
+++ b/Assets/Scriptables.meta
@@ -0,0 +1,8 @@
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diff --git a/Assets/Scriptables/EnemyAttributes.asset b/Assets/Scriptables/EnemyAttributes.asset
new file mode 100644
index 0000000..b389e2c
--- /dev/null
+++ b/Assets/Scriptables/EnemyAttributes.asset
@@ -0,0 +1,19 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &11400000
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
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+  m_PrefabAsset: {fileID: 0}
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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}
diff --git a/Assets/Scriptables/EnemyAttributes.asset.meta b/Assets/Scriptables/EnemyAttributes.asset.meta
new file mode 100644
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diff --git a/Assets/Scriptables/StatEffect.asset b/Assets/Scriptables/StatEffect.asset
new file mode 100644
index 0000000..8f4ca8c
--- /dev/null
+++ b/Assets/Scriptables/StatEffect.asset
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+  m_Name: StatEffect
+  m_EditorClassIdentifier: 
diff --git a/Assets/Scriptables/StatEffect.asset.meta b/Assets/Scriptables/StatEffect.asset.meta
new file mode 100644
index 0000000..b6740dd
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diff --git a/Assets/Scripts/Attribute.cs b/Assets/Scripts/Attribute.cs
index c8c9090..6c9a430 100644
--- a/Assets/Scripts/Attribute.cs
+++ b/Assets/Scripts/Attribute.cs
@@ -1,38 +1,24 @@
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
+[Serializable]
 public struct Attribute
 {
-    [SerializeField]
-    private long _base;
+    public long Base;
 
-    public Attribute(long stat)
-    {
-        _base = stat;
-    }
-
-    /// <summary>
-    /// Permanently increase the stat value.
-    /// </summary>
-    /// <param name="by">Increase amount.</param>
-    public void LevelUp(long by)
-    {
-        _base += by;
-    }
+    public Attribute(long stat) { Base = stat; }
 
     /// <summary>
     /// Calculates the stat value with accumulated buff and debuff modifiers.
     /// </summary>
-    /// <param name="baseBonus">Additive bonus applied before multiplicative scaling.</param>
-    /// <param name="permyriadBonus">Multiplicative scaling in hundredths of a percent. E.g., 625 permyriad corresponds to 6.25%.</param>
-    /// <param name="flatBonus">Additive bonus applied after multiplicative scaling.</param>
     /// <returns>(base + baseBonus) * (100% + permyriadBonus) + flatBonus, bounded below by 0.</returns>
-    public long Calc(long baseBonus, long permyriadBonus, long flatBonus)
+    public long Calc(EffectSO effect)
     {
-        var r = _base + baseBonus;
-        var m = permyriadBonus + 10000;
-        r = r * (m / 10000) + (r / 10000) * (m % 10000) + flatBonus;
+        var r = Base + effect.Base;
+        var m = effect.Permyriad + 10000;
+        r = r * (m / 10000) + (r / 10000) * (m % 10000) + effect.Flat;
         if (r <= 0)
         {
             return 0;
diff --git a/Assets/Scripts/EffectSO.cs b/Assets/Scripts/EffectSO.cs
new file mode 100644
index 0000000..f50bce1
--- /dev/null
+++ b/Assets/Scripts/EffectSO.cs
@@ -0,0 +1,45 @@
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "StatEffect", menuName = "Stat Effect")]
+public class EffectSO : ScriptableObject
+{
+    /// <summary>
+    /// Additive change applied before multiplicative scaling.
+    /// </summary>
+    public long Base;
+    /// <summary>
+    /// Multiplicative scaling in units of hundredth of a percent.
+    /// E.g., 625 permyriad is 6.25%.
+    /// </summary>
+    public long Permyriad;
+    /// <summary>
+    /// Additive change applied after multiplicative scaling.
+    /// </summary>
+    public long Flat;
+
+    /// <summary>
+    /// Create a new attribute effect instance.
+    /// </summary>
+    /// <param name="baseBonus"></param>
+    /// <param name="permyriad"></param>
+    /// <param name="flat"></param>
+    /// <returns></returns>
+    public static EffectSO New(long baseBonus = 0, long permyriad = 0, long flat = 0)
+    {
+        var effect = ScriptableObject.CreateInstance<EffectSO>();
+        effect.Base = baseBonus;
+        effect.Permyriad = permyriad;
+        effect.Flat = flat;
+        return effect;
+    }
+
+    /// <summary>
+    /// Create a new EffectSO from a percentage.
+    /// </summary>
+    /// <param name="p">Percentage. E.g., 6.25f results in a Permyriad of 625.</param>
+    /// <returns>Effect with the given percentage.</returns>
+    public static EffectSO FromPercent(float p)
+    {
+        return New(permyriad: (long)(p * 100));
+    }
+}
diff --git a/Assets/Scripts/EffectSO.cs.meta b/Assets/Scripts/EffectSO.cs.meta
new file mode 100644
index 0000000..a39567b
--- /dev/null
+++ b/Assets/Scripts/EffectSO.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/EnemyAttributesSO.cs b/Assets/Scripts/EnemyAttributesSO.cs
new file mode 100644
index 0000000..9d1a39f
--- /dev/null
+++ b/Assets/Scripts/EnemyAttributesSO.cs
@@ -0,0 +1,18 @@
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "EnemyAttributes", menuName = "Enemy Attributes")]
+public class EnemyAttributesSO : ScriptableObject
+{
+    [SerializeField] private Attribute STR;
+    [SerializeField] private Attribute CON;
+    [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()
+    {
+        return ScriptableObject.CreateInstance<EnemyAttributesSO>();
+    }
+}
diff --git a/Assets/Scripts/EnemyAttributesSO.cs.meta b/Assets/Scripts/EnemyAttributesSO.cs.meta
new file mode 100644
index 0000000..824414f
--- /dev/null
+++ b/Assets/Scripts/EnemyAttributesSO.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Scripts/HeroAttributesSO.cs b/Assets/Scripts/HeroAttributesSO.cs
new file mode 100644
index 0000000..2a949bb
--- /dev/null
+++ b/Assets/Scripts/HeroAttributesSO.cs
@@ -0,0 +1,18 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class HeroAttributesSO : ScriptableObject
+{
+    [SerializeField] private Attribute STR;
+    [SerializeField] private Attribute MAG;
+    [SerializeField] private Attribute DEX;
+    [SerializeField] private Attribute CON;
+    [SerializeField] private Attribute CHA;
+    [SerializeField] private Attribute FTH;
+
+    public static HeroAttributesSO New()
+    {
+        return ScriptableObject.CreateInstance<HeroAttributesSO>();
+    }
+}
diff --git a/Assets/Scripts/HeroAttributesSO.cs.meta b/Assets/Scripts/HeroAttributesSO.cs.meta
new file mode 100644
index 0000000..a052f16
--- /dev/null
+++ b/Assets/Scripts/HeroAttributesSO.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Tests/AttributeTest.cs b/Assets/Tests/AttributeTest.cs
index 8668e08..bfb95d4 100644
--- a/Assets/Tests/AttributeTest.cs
+++ b/Assets/Tests/AttributeTest.cs
@@ -7,19 +7,18 @@ using UnityEngine.TestTools;
 public class AttributeTest
 {
     [Test]
-    [TestCase(1000000, 0, 0, 0, 0, ExpectedResult = 1000000)]
-    [TestCase(1000000, 1, 0, 0, 0, ExpectedResult = 1000001)]
-    [TestCase(1000000, 0, 2, 0, 0, ExpectedResult = 1000002)]
-    [TestCase(1000000, 0, 0, 10000, 0, ExpectedResult = 2000000)]
-    [TestCase(1000000, 0, 0, 0, 3, ExpectedResult = 1000003)]
-    [TestCase(0, 1000000, 1000000, 5000, 1000, ExpectedResult = 3001000)]
-    [TestCase(1000000, 0, 0, -10000, 0, ExpectedResult = 0)]
-    [TestCase(1000000, 0, 0, -20000, 0, ExpectedResult = 0)]
-    [TestCase(1000000, 0, 0, -20000, 50, ExpectedResult = 0)]
-    public long Calc(long startStat, long levelUp, long baseBonus, long permyriadBonus, long flatBonus)
+    [TestCase(1000000, 0, 0, 0, ExpectedResult = 1000000)]
+    [TestCase(1000000, 1, 0, 0, ExpectedResult = 1000001)]
+    [TestCase(1000000, 0, 2, 0, ExpectedResult = 1000200)]
+    [TestCase(1000000, 0, 0, 10000, ExpectedResult = 1010000)]
+    [TestCase(0, 1000000, 5000, 1000000, ExpectedResult = 2500000)]
+    [TestCase(1000000, 0, -10000, 0, ExpectedResult = 0)]
+    [TestCase(1000000, 0, -20000, 0, ExpectedResult = 0)]
+    [TestCase(1000000, 0, -20000, 0, ExpectedResult = 0)]
+    public long Value(long startStat, long baseBonus, long permyriadBonus, long flatBonus)
     {
         var attr = new Attribute(startStat);
-        attr.LevelUp(levelUp);
-        return attr.Calc(baseBonus, permyriadBonus, flatBonus);
+        var effect = EffectSO.New(baseBonus, permyriadBonus, flatBonus);
+        return attr.Calc(effect);
     }
 }