User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-1509826-20120313193555/@comment-3045936-20120313205127

But if I would have to guess given by Jared's statement. Something like one of the Alphas or her early creations morphed into the species that makes up the rare species of the Phoenixs. And now can kill or at least harm her. As even Dean says it calls Elias the only Phoenix thus shown a monster, due to his weakness to iron. But even Fairies are harmed by iron and they have been confirmed as another unique species of supernatural beings like pagan deities or angels that weren't created by Eve.