He is Goetia, as in the Ars Goetia. He is literally the hivemind/ritual made up of the 72 demons from that book, all of which take the form of giant pillars made up of human bodies and eyes.
He is one of the Beasts, and the one responsible of killing mankind by burning the planet surface across space at time at history's key points. He is doing that because he cares about humanity and doesn't like us dying, so his plan involves killing us all so he can remake humanity without that bothersome mortality. Who can blame him, am I right?
He is currently residing the hijacked corpse of the King Solomon.