Godsvivors

Hades appears after time has expired, and is noticeably easier than Thanatos. He will primarily summon skeletons around him out of the ground, but if you've made it this far then you're likely to be able to mow down those skeletons without issue. If he gets close, he'll slash at you. He can also shoot an orb at you that returns to him like a boomerang, but if you stay far enough away, he doesn't seem to do that attack very often. Focus fire on him behind you until you take him out, beating the game.