Vampires (The Steampunk Adventures of Sorcerers' Apprentices)

Vampires are humans whom infected by supernatural pathogen that bestowed them heightened sense, supernatural strength, speed, agility, and ability to disperse into a swarm of triangle-winged bat-like creatures and reformed at will, and transformed into huge bat-like creature, all of them at the costs of bloodlust where they must feed on human blood to keep that thirst from corrupt them.