User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-168.169.25.92-20151106203019/@comment-3481504-20151107063945

Even with or without their powers, archangels don't stand a chance against a Levi and couldn't inflict lasting damage, without them just healing from it. The ONLY thing that can kill them is the bone, so no matter how powerful archangels are, they couldn't smite a Leviathan, and even if they could implode one, they'd just regenerate.