The Chechari Djinn
This is a tribe of Djinn that are so powerful Islam decided not to speak of them for fear of bringing their eye on them. They have such power that King Solomon decided to limit their interactions with humans. This is a portal complete with guardian that will protect you, the Chechari feed on human fear and anguish. They have no concious remorse for anything. They take blood as well but are not vampire, they feed on the flesh of humans, making you rot from the inside out. they are so powerful I will also limit their interactions with you, but make no mistakes they will get the job done.
The Chechari are used for black art and evil deeds.