feat: disable invuln for plugin damage + DamageUtil + DiamondTri/Barrage/Overhead nerf

src/main/java/me/sashegdev/blackknife/DamageUtil.java

@@ -0,0 +1,23 @@
+package me.sashegdev.blackknife;
+
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+import org.bukkit.persistence.PersistentDataType;
+
+public class DamageUtil {
+    public static void apply(Player attacker, LivingEntity victim, double amount) {
+        victim.getPersistentDataContainer().set(SwoonHandler.MAGIC_DAMAGE, PersistentDataType.BYTE, (byte) 1);
+        victim.damage(amount, attacker);
+        victim.getPersistentDataContainer().remove(SwoonHandler.MAGIC_DAMAGE);
+        victim.setNoDamageTicks(0);
+        victim.setMaximumNoDamageTicks(10);
+        BlackKnifePlugin.getInstance().getServer().getScheduler().runTaskLater(BlackKnifePlugin.getInstance(), () -> {
+            if (victim.isValid() && victim.getMaximumNoDamageTicks() == 0) victim.setMaximumNoDamageTicks(10);
+        }, 1L);
+    }
+
+    public static void applyRaw(Player attacker, LivingEntity victim, double amount) {
+        if (victim instanceof Player pl && pl.isBlocking()) amount /= 2.5;
+        apply(attacker, victim, amount);
+    }
+}