Prerequisites: You have been bitten by a vampire and have drank a vampire’s blood
You no longer need to breathe and do not age. While you can eat common food, you do not need it to survive. You need only to drink blood from a living host at least once a week in order to survive. If a Vampire goes without blood for a week they will slip into a kind of hibernation from which they cannot awake unless given fresh blood. Blood from the dead will not suffice as it is indigestible and repulsive.