User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-184.77.255.73-20111214195052/@comment-3481504-20111218010553

In "Slash Fiction", the leviathan head, Dick Roman, said he would wipe out the demon population if he wasn't tending with another matter, and they could at least match, if not kill, a seraph, seeing as they're older than them. By the way, Cas isn't a seraphim. Also, angels are naturally stronger than demons. But, some demons, particularly Alastair and Azazel, have ways of harming a celestial, through spellwork, etc.. And yes, Jesse can vanquish the host of Heaven, at least according to Cas.