An Astral Vampire is a spirit entity that maintains it's existence by feeding off of the life-force of human victims. There are three basic types of astral vampires.
1.) Living Astral Vampires - This form of astral vampire is a living psychic vampire who can astral travel in order to feed from victims.
See Also Slip Skin Hags
2.) Earthbound, Spirits of Psychic Vampires - This form of astral vampire is the spirit of a deceased psychic vampire who fails to cross over into the afterlife. These astral vampires become "real vampires" and continue to prey off of living victims in order to maintain their existence.
This type of astral vampire can be either free-roaming or bound to a specific location. The free-roaming type is more often recognized as being vampiric while the type that is bound to a location is often labeled as being a ghost. Reference the reported cases of hauntings in which people claim to feel constantly fatigued, depressed, and suffer sickness and pains wile living in a reported haunted house.
3.) Non-human Spirit Entities - This form of astral vampire is a non-human spirit entity, one which has never been human. These entities maintain their existence by preying off of the life-force of human beings.