I know there is a type of vampiric medical condition where a person MUST drink another persons blood or eat their flesh in order to survive. Their bodies don't produce the same nutrients as everyone else that's why they're like that.
Also, there are psychic vampires which is a modern terminology for Incubbi's and Succubi's (medieval usage). They are a bit like the blood-sucking vampire except they drain energy from their victims.
They are human. Some are known to take energy from their victims whilst they are sleeping, this is known as 'dream walking'. There are a few types of psychic vampires:
You have....
- The EMO vampire:
These vampires get their energy through their victims emotions
- The SEXUAL vampire:
Gets energy from having sex with their victim
- The ASTRAL vampire:
is like the goth, satanist type....enough said.
Then you've got the other psychic vampires that get energy from the elements like fire, water, earth etc. These psi vampires have more self-control and more experience.
They can go longer without draining energy from people and opt for the elements or someone who is willing to give some of their energy to them. Younger vampires lack self-control and over indulge.
Hope this was informative.