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I know there are the traditional theories of how vampirism came to be i.e. Demons, lillith, disease, lucifer, curse. Im looking for new theories be creative think outside the box.

So you know that Cain (Abel's brother) is the first vampire?

Nothing scripture wise speaks of vampires at all so no i don't believe that personally. Killing another human doesn't create vampires. Just a murderer that's all.

Lilith wasn't a vampire.

Lucifer wasn't a vampire.

Not unless you view all of divine entities as vampires.

Perhaps vampyres are simply angelics on Earth who pull energy from others because their souls aren't used to being away from "Home" so-to-speak where all the pure energy exists and where they live. So to sustain that "soul energy" one must feed in order to feel revived.
^ that theory comes from my beloved Aexander.