User blog comment:Egyptian Hybrid/Leviathen vs Archangel/@comment-89.231.241.20-20170406132439/@comment-31647781-20170406153342

I don't know. The later seasons may have been a retcon, because the Archangels are God's only confirmed Primordial Creation, and they certainly knew about Amara (the oldest entity who was once omnipresent), and Death stated that only Amara existed before God and the Archangels, so the Leviathans, I would have to assume, would have been created later, since the Archangels were created when there was no physical plane of existence. I doubt there were Leviathans running around when God was fighting Amara with the Archangels and Death was just chilling.