diff --git a/Resources/BossPhases/testphase.tres b/Resources/BossPhases/testphase.tres
new file mode 100644
index 00000000..a1b50a3d
--- /dev/null
+++ b/Resources/BossPhases/testphase.tres
@@ -0,0 +1,27 @@
+[gd_resource type="Resource" script_class="BossPhase" load_steps=4 format=3 uid="uid://c2xhuinmhit15"]
+
+[ext_resource type="Script" path="res://Scripts/Resources/BossPhase.cs" id="1_cxesb"]
+[ext_resource type="Script" path="res://Scripts/AttackPatterns/SpiralPattern.cs" id="1_q8vp4"]
+
+[sub_resource type="Resource" id="Resource_8caj3"]
+script = ExtResource("1_q8vp4")
+bulletSpeed = 5.0
+bulletCount = 16
+rotationSpeed = 0.0
+_rotationOffset = 0.0
+duration = 5.0
+burstInterval = 0.5
+spread = 360.0
+owner = 2
+_damageType = 0
+_bulletDamage = 1.0
+_timeModifiers = Array[Resource]([null])
+_targetPlayer = false
+WaitForCompletion = true
+
+[resource]
+script = ExtResource("1_cxesb")
+PhaseName = "asdf"
+Threshold = 0
+PlayAnimation = false
+Patterns = Array[Object]([SubResource("Resource_8caj3")])
diff --git a/Scripts/AttackPatterns/SpiralPattern.cs b/Scripts/AttackPatterns/SpiralPattern.cs
index 426bba98..99179601 100644
--- a/Scripts/AttackPatterns/SpiralPattern.cs
+++ b/Scripts/AttackPatterns/SpiralPattern.cs
@@ -22,7 +22,7 @@ public partial class SpiralPattern : AttackPattern
     [Export] private BulletOwner owner = BulletOwner.Enemy;
     [Export] private DamageType _damageType = DamageType.Neutral;
     [Export] private float _bulletDamage = 1f;
-    [Export] private Resource _modifier;
+    [Export] private BulletCreationModifier _modifier;
     [Export] private Array<Resource> _timeModifiers;
 
     [Export] private bool _targetPlayer = false;
@@ -69,7 +69,7 @@ public partial class SpiralPattern : AttackPattern
                 Spread = spread,
                 BulletScene = BulletScene,
                 RotationOffset = angleOffset,
-                Modifier = _modifier as IBulletModifier,
+                Modifier = _modifier,
                 TimeModifiers = _timeModifiers?.Where(mod => mod is TimeModifier).Cast<TimeModifier>().ToList() ?? new List<TimeModifier>()
             });
             
diff --git a/Scripts/AttackPatterns/TargetedPattern.cs b/Scripts/AttackPatterns/TargetedPattern.cs
index 195a1b4a..cde42b14 100644
--- a/Scripts/AttackPatterns/TargetedPattern.cs
+++ b/Scripts/AttackPatterns/TargetedPattern.cs
@@ -17,7 +17,7 @@ public partial class TargetedPattern : AttackPattern
     [Export] private int bulletsPerShot = 1;
     [Export] private float spread = 0f;
     [Export] private BulletOwner owner = BulletOwner.Enemy;
-    [Export] private Resource modifier;
+    [Export] private BulletCreationModifier modifier;
 
     private double timer;
     private double burstTimer;
@@ -42,7 +42,7 @@ public partial class TargetedPattern : AttackPattern
         burstTimer += delta;
         if (timer < duration && burstTimer >= burstInterval && _gameManager.PlayerPosition.HasValue)
         {
-            spawner.SpawnTargetedBullet(Boss.GlobalPosition, _gameManager.PlayerPosition.Value, bulletSpeed, owner, BulletScene, bulletsPerShot, spread, modifier as IBulletModifier);
+            spawner.SpawnTargetedBullet(Boss.GlobalPosition, _gameManager.PlayerPosition.Value, bulletSpeed, owner, BulletScene, bulletsPerShot, spread, modifier);
             burstTimer = 0;
         }
     }
diff --git a/Scripts/Resources/BulletCreationModifier.cs b/Scripts/Resources/BulletCreationModifier.cs
new file mode 100644
index 00000000..16bd9323
--- /dev/null
+++ b/Scripts/Resources/BulletCreationModifier.cs
@@ -0,0 +1,9 @@
+using Godot;
+
+namespace Cirno.Scripts.Resources;
+
+[GlobalClass]
+public abstract partial class BulletCreationModifier : Resource, IBulletModifier
+{
+    public abstract float ModifySpeed(float baseSpeed, int bulletIndex, int totalBullets);
+}
\ No newline at end of file
diff --git a/Scripts/Resources/BulletResource.cs b/Scripts/Resources/BulletResource.cs
index 34d98790..e9d19625 100644
--- a/Scripts/Resources/BulletResource.cs
+++ b/Scripts/Resources/BulletResource.cs
@@ -19,7 +19,7 @@ public partial class BulletResource : Resource
     [Export] public DamageType DamageType = DamageType.Neutral;
 
     [Export]
-    public Resource Modifier;
+    public BulletCreationModifier Modifier;
     [Export] public Array<Resource> TimeModifiers;
     
     public BulletInfo MakeBullet(Vector2 position, int count = 1, float spread = 0f, float rotationOffset = 0f)
@@ -36,7 +36,7 @@ public partial class BulletResource : Resource
             Spread = spread,
             BulletScene = BulletScene,
             RotationOffset = rotationOffset,
-            Modifier = Modifier as IBulletModifier,
+            Modifier = Modifier,
             LifeTime = LifeTime,
             DestructionParticlesScene = DestructionParticlesScene,
             TimeModifiers = TimeModifiers?.Where(mod => mod is TimeModifier).Cast<TimeModifier>().ToList() ??
diff --git a/Scripts/Resources/DecreasingSpeedModifier.cs b/Scripts/Resources/DecreasingSpeedModifier.cs
index bce1a105..a3a66ad1 100644
--- a/Scripts/Resources/DecreasingSpeedModifier.cs
+++ b/Scripts/Resources/DecreasingSpeedModifier.cs
@@ -3,11 +3,11 @@
 namespace Cirno.Scripts.Resources;
 
 [GlobalClass]
-public partial class DecreasingSpeedModifier : Resource, IBulletModifier 
+public partial class DecreasingSpeedModifier : BulletCreationModifier, IBulletModifier 
 {
     [Export] private float decreaseRate = 0.1f;
 
-    public float ModifySpeed(float baseSpeed, int bulletIndex, int totalBullets)
+    public override float ModifySpeed(float baseSpeed, int bulletIndex, int totalBullets)
     {
         return Mathf.Max(0, baseSpeed - (decreaseRate * bulletIndex));
     }
diff --git a/Scripts/Resources/SpeedModifier.cs b/Scripts/Resources/SpeedModifier.cs
index d305bd54..f05061f3 100644
--- a/Scripts/Resources/SpeedModifier.cs
+++ b/Scripts/Resources/SpeedModifier.cs
@@ -3,7 +3,7 @@
 namespace Cirno.Scripts.Resources;
 
 [GlobalClass]
-public partial class SpeedModifier : Resource, IBulletModifier
+public partial class SpeedModifier : BulletCreationModifier, IBulletModifier
 {
     [Export] public SpeedModifierType ModifierType;
     [Export] public EasingType Easing;
@@ -11,7 +11,7 @@ public partial class SpeedModifier : Resource, IBulletModifier
     [Export] public float MinimumSpeed = 10f;
     [Export] public float ScalingFactor = 10.0f;
 
-    public float ModifySpeed(float baseSpeed, int bulletIndex, int totalBullets)
+    public override float ModifySpeed(float baseSpeed, int bulletIndex, int totalBullets)
     {
         if (totalBullets <= 1)
             return baseSpeed;