User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5110811-20150606161023/@comment-5961531-20150610090414

^

This.

Nothing Death stated in the season ten finale contradicts what Death told us about Leviathans in season seven. All he said was that before God and the Archangels, there was the Darkness, and God and his Archangels then went to war with this force. Well, he has yet to give an explanation as to why they went to war. That reason could well be that the Darkness corrupted the Leviathans. God then retaliated by creating Archangels who could assist in fighting the Darkness.