1) vampirism has existed on Earth since that period when Neanderthals disappeared and Cro Magnons became the norm. its source is not completely understood. the roots appear to be thoroughly spiritual. those with the 'life-eater' burden (as it is called) struggled to explain it. they broke into 2 strains, the noble vampires (angel-like beings who only 'cull the wicked') and the noxious vampires ( who suffer from no moral dilemmas).