The best option to fix this, is just to extend the time spawn from the first message as I've wrote before its bugged on twifysoft, it should take 15-20 minutes for the feru to spawn after the first message, also people should be forced to purchase a ticket, in order to pass the energy wall. But I know that people will cry, cuz they will need to be next to the body when feru dies, but that will be almost impossible since there will be 500 people there, so you should introduce the new boss system.