User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-63.117.245.61-20120512193405/@comment-84.178.153.12-20120513164022

Castiel with all souls from the purgatory had a lot more power than Michael or Lucifer. He was at few levels higher than their power. He killed Raphael with his fingers and it took him just a second and he did not need a blade. Also he was immune to the blade what shows that he was too powerful for it. I think he got also power from the Leviathans when they were into him but maybe I am wrong. Archangels would probably have only physical powers against Leviathans. That would be a good fight but we wont see that happen.