In writing my story I made my villains into vampires because, hey, vampires are cool and have superpowers. However, further on I realized that maybe the villains need not be vampires, and devised a possible explanation for their powers, but the outcome of my brainstorming has them being quite close to vampires still. Basically, instead of sucking blood, they do some sort of demonic conversion, and the victim, instead of becoming a vampire, becomes a cold blooded, flesh eating, blood drinking maniac who needs to keep feeding themself to retain their sanity. Basically becomes a servant, but can not ascend to the level of the creature who converted them. Should I just go ahead and call them vampires, taking advantage of all the lore that surrounds them, or are they different enough to be called something else?