Bulgarians believed children born on Saturdays and died before baptisim would rise from the grave nine days after burial.
The vampire revenant would be called istral or “lost heart”. The istral preys on life stock , killing five more a night, by drianing it of blood.
Only a vampirdzhija (a vampire hunter) can kill it.
In the astral plane exists the Caballi a vampire being, that preys on other astral beings. It can also prey upon humans who are passing through the Astral plane and sexually driven mediums.
Similar to the Inccubus/Succubus it seeks prey who enjoy satisfying their voracious needs.
Latching on to those humans and using their bodies during sexual activity.
Caballi is created when a man dies before his natural time. His soul travels to the astral plane. He keeps his mind, intellect, and desire to interact with the world.
The Caballi will possess a psychic medium so for a little while it will have a sense of sensation.
Daylight kills the Caballi, which will end any possessions.