User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-28835160-20140701145316

I would have to say Leviathan since it is stated they are the first of beasts.

I don't know about the Archangel beat Leviathan thing. That's up for debate because yes Archangels are really powerful, but Leviathans are really hard to kill so it would be a tough fight, but it depends on if the Leviathan has gotten a hold of a Archangel Blade or not. If he has maybe the Leviathan would win.