User blog comment:EmpyreanSmoke/Supernatural Q&A (Closed)/@comment-172.101.67.105-20151117012137/@comment-93.216.39.96-20151117132121

If it was that easy to kill an archangel why didnt casiel use an angel blade to kill raphael. He needed 50000 souls plus heavens weapon and even that was not enough. So i am pretty sure than an angel blad cannot kill archangels.