Quote Originally Posted by LeCrestfallen View Post
you need both though without dark amaterasu, or you switch to an -def down eidelon instead. But since those are also rare, having both is the best choice. on a side note, thanatos does from what i can tell quite a lot of damage, so its a viable dps option.
Without Dark Ama, you'd have a 4th slot available anyways though, so no need to choose between Hades, Satan and Thanatos.