User blog comment:FTWinchester/Retcon of Avalon/@comment-3481504-20121126022654/@comment-5619706-20121126022854

Yes, I know; It's very hard to trump angels, especially archangels. In fact, although I believe Leviathans could kill Archangels, I still find the celestials more awesome.

Still, we are running out of lore that could fall in line with the series, and going older than the Leviathan could only go so much (or so few).