[DoYrdenDzirt]

На всех. По отдельности можно так:

	@Override
	public boolean onKillEvent(QuestCookie env)
	{
		Player player = env.getPlayer();
		Npc npc = (Npc) player.getTarget();
		
		if(npc.getObjectId() == eventnpc[0].getObjectId())
			ItemService.addItem(player, itemId, count);
		
		if(npc.getObjectId() == eventnpc[1].getObjectId())
			ItemService.addItem(player, itemId, count);
	}