User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-66.222.138.158-20120519024006/@comment-3481504-20120519024328

that's consensus, though. I KNOW Leviathans are older, but absolutely not more powerful.

A little scale:

Archangels > Leviathans > Seraphs > Angels (are certifiably more powerful, but Eve can shut off their power, "jam" their connection) > Eve > Cupid.