User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-4003779-20110925020710

Thats a good question. Although even if an archangel can kill one, there is no more Archangels left except Michael and Lucifer. Who both are locked in the cage, and want the Apocalypse to happen. Although in the world of Supernatural is always something older than them (probably not). My theory is that they are going to find a friendly one who helps them defeat the other leviathans.