mcinnis138 says:
A ghoul is a human that drinks vampire blood. It extends their lives and gives some minor powers, but also creates a fierce addiction. If the ghoul does not drink at least 1/month from a vampire, they begin to age rapidly to the age they should be physically as well as losing all other benefits. Further, they are generally enthralled to the one they drink from and have an obsessive unnatural loyalty to that vampire.
So basically a vampire that drink vampire blood an need to that blood to live and become a Slave
to the vampire they drink from?