src/main/java/systems/brn/tweaks/Tweaks.java

@@ -15,6 +15,9 @@ public class Tweaks implements ModInitializer {
     public static final GameRules.Key<GameRules.IntRule> SHIELD_AXE_COOLDOWN =
             GameRuleRegistry.register("shieldAxeCooldown", GameRules.Category.PLAYER, GameRuleFactory.createIntRule(100, 0, Integer.MAX_VALUE));
 
+    public static final GameRules.Key<GameRules.IntRule> CRITICAL_MULTIPLIER =
+            GameRuleRegistry.register("criticalHitMultiplier", GameRules.Category.PLAYER, GameRuleFactory.createIntRule(150, 0, Integer.MAX_VALUE));
+
     @Override
     public void onInitialize() {
     }

src/main/java/systems/brn/tweaks/mixin/PlayerEntityMixin.java

@@ -26,4 +26,17 @@ public abstract class PlayerEntityMixin {
         }
         return original;
     }
+
+    @ModifyConstant(
+            method = "attack",
+            constant = @Constant(floatValue = 1.5F)
+    )
+    private float modifyCriticalMultiplier(float original) {
+        PlayerEntity player = (PlayerEntity)(Object)this;
+        if (player.getWorld() != null && player.getWorld() instanceof ServerWorld serverWorld) {
+            GameRules.IntRule rule = serverWorld.getGameRules().get(Tweaks.CRITICAL_MULTIPLIER);
+            return rule.get() / 100.0F;
+        }
+        return original;
+    }
 }