User blog comment:Twilight Despair 5/New Plots/@comment-3045936-20180525033607/@comment-74.132.82.188-20180525232645

For what it´s worth, in Season 13 Episode 4, the Cosmic Entity claims that the Empty predates God and Amara:

COSMIC ENTITY Oh, yes. Excellent question. You see, before God and Amara, creation, destruction, Heaven, Hell, your precious little Earth, what was there?

CASTIEL Nothing. COSMIC ENTITY Yes. That’s right. Nothing. Nothing but Empty. And you are soaking in it. Angels and demons, you all come here when you die.