[quote=@jasonwolf]
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no diseases come about from animals. this disease was created in the infernal plain and somebody got infected with it while messing around with stuff they shouldn't


I don't know who for all we know we could say it was lilith in her new hatred with god trying to get power to break back into eden and well shucks this disease instead is what she gets and it transforms her into a prime vampire.
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for all we know it was a supernatural biological terrorist who has been alive for thousands of years and wishes for the annihilation of all things unholy