this idiot forgot to commit an entire month's worth of code

Assets/Scripts/Abilities/Upgrades/KillCooldownRuntimeObject.cs

@@ -0,0 +1,16 @@
+using System;
+using UnityEngine;
+
+public class KillCooldownRuntimeObject : MonoBehaviour
+{
+    public PlayerAbility ability;
+    private void Start()
+    {
+        Enemy.OnKill += UpdateKills;
+    }
+
+    public void UpdateKills()
+    {
+        ability.currentCooldown -= 1;
+    }
+}