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Vampires: Cases
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It seems that until the 19th century, vampires in Europe were thought to be hideous monsters rather than the debonair, aristocratic vampire made popular by later fictional treatments. They were usually believed to rise from the bodies of suicide victims, criminals, or evil sorcerers, though in some cases an initial vampire ... "born of sin" could pass his vampirism onto his innocent victims. In other cases, however, a victim of a cruel, untimely, or violent death was susceptible to becoming a vampire. Most of the European vampire myths have Slavic and/or Romanian origins.
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A major prey-related problem that vampires faced was the predator-prey ratio. In most every case where one species eats another, the prey species is at least an order of magnitude more numerous than the predator, and breeds faster. The reasons for this are obvious: the transfer of food energy between trophic levels is very inefficient. Cows have to eat ten kilograms of grass to make one kilogram of cow; it takes ten kilograms of cow to make one kilogram of human; and of course, it takes ten kilograms of human to make one kilogram of vampire. So at any given level, the level below you must out-produces you by at least ten to one, or you'll exterminate your own food supply.
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This is especially the case with Tepes-vampires, since they can hypnotise their victims. While the broad stereotypical powers and weaknesses associated with vampires in the movies correspond to Tepes-Vampire abilities, Lilith-vampires can ... use trickery, deception, or force to sire a vampire.
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