The Fallen Devil Emperor naturally was the strongest expert in this entire region. A command from him would make the lords of all the devil islands here do his bidding. His words were the law. And hence, the birthday celebration of the devil emperor every hundred years was naturally the grandest occasion in the Fallen Devil Region.
There wasn't any tyrannical feeling from him, the devil emperor merely smiled as he sat on his devil throne, giving off a feeling that he was the lord of this world.