@EventHandler
	public void onDamageByEntity(EntityDamageByEntityEvent e){
		Player p =(Player) e.getEntity();
		Player attacker = (Player)e.getDamager();
		if(p instanceof Player && attacker instanceof Player){
		    p.addPotionEffect(new PotionEffect(PotionEffectType.POISON , 60 , 1));
		}
	}