User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-2120712-20111120191215/@comment-63.117.245.61-20111126180503

actually demon powers do work on angels if they are strong and old enough. Alastair, Azazel, and Lilith are older than Castiel. As shown, Alastair has beaten Castiel twice. The second time he used demon magic.