private void invisibility (Player player, int level, ItemStack i) {
		
		int duration = 0;
		int cooldown = 1000;
		
		if (level == 1) {
			duration = 200;
		} else if (level == 2) {
			duration = 300;
		} else if (level == 3) {
			duration = 400;
		}
		
		if (invisDurabilityTimer.cooldownMap.get(player) == null) {
			invisDurabilityTimer.cooldownMap.put(player, 0);
		}
		
		if (invisDurabilityTimer.cooldownMap.get(player) == 0) {
			player.addPotionEffect(new PotionEffect(PotionEffectType.INVISIBILITY, duration, 1, true));
			
			
			durabilityTimer(i, cooldown, player);
			
		} 
	}