User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-190.92.7.204-20150612220839/@comment-190.92.7.204-20150619153457

But Cain could kill Castiel Easy and lets not forget that when in purgatory Castiel was fighting with 2 or 3 leviathan and he did not die so he is stronger than some leviathan maybe not the high level ones but stronger than the others so from that we can asume that Cain is stronger plus Leviathan can kill Cain because only someone with the mark and the first blade can plus they cant block a demon's power that's why rick needed a devils trap to capture crowley