User blog comment:KaineDestiny/Lucifer - EVE - Possible Theory/@comment-24461572-20141105003341

Interesting Twilight. I had not heard of that. My theory was that somehow before he was locked in the cage that he cracked open Purgatory and altered a Leviathan. The show was never really clear but it seemed that Eve either predated the Leviathan or she was one but slightly diluted or altered.