Cult of Rassilon the Vampire
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Toward the end of his life Rassilon became a vampire (which is why time lords and vampire share 98% of the same genes) and a Gallifreyan cult sprang up around this occurance. In the Capitol in the capitol in ducts and serviceways where The time lady Ruath was a member of this cult. She possesed the Sigil ring of the Great Vampire. The cult was a small one with prophesies detailing the coming of the Vampire Messiah. One book was made out of human flesh and the spine was literally a spine.
