User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5961531-20150529201458

I'd say Leviathans.

Also, what if the Darkness was the one that corrupted the Leviathans into being evil, sadistic monsters that want to eat everything?? If that is the case, that's why God would have then decided to wage war against the Darkness, so any future creations of his wouldn't turn into evil beings. That's when he created Archangels. Which by the way, also explains why they are so much more powerful than all other types of Angel.

If this is true, then the Leviathans can still be older than the Archangels, without ruining previously established lore.