Vampire

In the Night Huntress universe, vampires are supernatural creatures who must feed on human blood in order to survive. Vampires are one of several known species of sentient supernatural creatures, the others being half-vampires, ghouls, ghosts, and demons.

History and origin
The first vampire was created when Cain, the son of Adam and Eve, killed his brother Abel. As a result, God cursed Cain with vampirism, making Cain the first vampire. Since the only way to create a vampire is by transforming a human, vampires are sometimes also known as "Children of Cain".