User blog comment:Tommy,Klaus&Kol2012+/A theory about the empty guardian/@comment-10889355-20181211013723/@comment-3045936-20181213215224

[in Kelly’s heaven] CAS: You're the Empty. COSMIC ENTITY: Pretty good, huh? You ready to go? CAS: You stay away from him. COSMIC ENTITY: Castiel, you know how this goes-- the good souls here, the bad souls there. The angels are mine. CAS: Enough. COSMIC ENTITY: Stop interrupting! Start paying attention. I'm taking him. And where I'm taking you is worse than Hell… because at least Hell is something. Ohh. Ohh, God, they look scared. Does that hurt you? Good… because I want it to.

From the Transcript. Just showing this so people don’t assume I’m am speculating “what” Cas and the Entity said.