User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-203.81.71.69-20140507062832/@comment-3481504-20140508230939

It's confirmed by evidence all throughout season five, but not in the sense of a straight out verbalization. But, be real, a straight out verbalization for anything has become hard to come by. We're kinda left to connect the dots. You'd be atrociously wrong to think Leviathan can kill an archangel, for reasons that I've given sooooo many times throughout this wiki. I'm talking conventionally archangels are in the same boat as Leviathan where only one weapon can kill them.