Leviathan

Maybe it is because of agoraphobia or if he is lonely by nature, but he generally likes going inside the coffin he carries around and spending time by himself. He envies even himself from a second ago and deals with everything quickly and precisely. He is a beloved king, and there is a saying that you shouldn't challenge Leviathan unless you are determined to kill every last population of Hades.
He brings unidentifiable creatures from the coffin. Most of them are terrible beings and cosmic terrors that existed in the past, and meeting them means you are at the end of your life.