User blog comment:Twilight Despair 5/Fanmade Supernatural Beings/@comment-4554525-20121124020324/@comment-5619706-20121125035135

Behemoth and Ziz does not appear in the mainstream bible of today, rather in earlier texts, if I'm not mistaken. But I doubt the writers will take the direction of Behemoth and Ziz, as they seem intent on letting Purgatory go. Otherwise, whispers of Eve and her relationship to the Leviathan would already be surfacing. Also, how would they make Behemoth and Ziz interesting considering all three are equal in power, but one is on land, one for water, and one for air. The Leviathan were made practically indestructible, how would the other two fare?

Don't get me wrong, I personally think Eve and her dragons are the best thing that happened from Purgatory, followed closely by Leviathans in their native form. But if we are to receive any new lore on them, we should be having them now, instead of flashbacks focusing mainly on Dean, Castiel and Benny's escape and their respective relationships.