Brethren of Seth
One of the oldest cults in Egypt, the Brethren of Seth claim to have originated in the pre-dynastic times. Their height was during the 21st dynasty (1090-945 B.C) at Tanis, when their priests became the pharaohs of Egypt. They claim the god Seth was once mortal, the son of the first pharaoh to unite upper and lower Egypt. He fought and killed his father, drinking his father's blood in his triumph. Ever after he was forced to continue this blood drinking.
The Brethren of Seth conduct ceremonies involving drinking the blood of sacrificed humans, sure that this act will prolong their lives if they are true to their god. they travel to a fallen temple beyond the pyramids each month for their ceremonies. The temple is surrounded by hidden pits full of venous snakes.
The High Priest claims to be the living Seth. He is ancient but looks to be middle aged, with eyes that have seen far too much life. Some say that he is a vampire, older than Fennalik of Europe.