User blog comment:KaineDestiny/Lucifer - EVE - Possible Theory/@comment-3045936-20141026224833

I don't know where I remember reading it. Nor do I remember if it's canon. But maybe it was Bobby's Guide to Hunting that tells that Eve made the Swords that can kill Dragons. I think it was one of those Guides, but not sure. But if I recall, than Eve was a creature that formed from all the things in purgatory, presumably dead Leviathans.