Spirit derives from Sumerian/Babylonian mythology.
The Edimmu were a vengeful type of evil jinn with a vampiric tendency (sucked the life out of the vulnerable and the sleeping - most commonly the young).
It was believed that a person could become an Edimmu by a violent death (murder, drowning, etc.), leaving a corpse mutilated or unburied, if proper funeral rites were not observed, or if there was nobody who cared for the soul.
Forbiddens are very aggressive that can attack everything - including summoner and allies.
Summoning ingredients requires: Black Crystal