Porphyrias. Originating in Transylvania, the disease was penance for cannibals and those who took pleasure in feeding on the blood of another. This disease ravaged the infected body; drained the tone of their skin, caused them to grow fangs, disallowed for them to leave the house in the day and plagued them with an unending thirst for human blood. Those that were infected came to be known as vampires. Eventually, the diseased few turned too many and...