User blog comment:ImperiexSeed/ARCHANGEL or LEVIATHAN!/@comment-149.210.105.71-20130514175442/@comment-24834479-20140914230920

God locked the Leviathans in purgatory because He thought they would overpower and destroy the rest of his creation. That includes archangels. Both Death and Castiel said that Leviathan are more powerful than Angels. They didn't say "all angels, besides the archangels." They said Angels, and didn't leave out the archangels, because the leviathans are more powerful.