Sarkt is an illithid sorcerer. It was cast out of its community for its heretical studies (Sarkt was, in fact, lucky to escape alive). It didn’t take the cunning creature long to pick up a few thralls and find a new place to live, safe from the murderous intentions of its comrades.
Sarkt dwells in the subterranean ruins of an ancient, abandoned shrine to Blibdoolpoolp, the crustacean-headed deity of the kuo-toas. This shrine lies on the fringe of a region controlled by the kuo-toas, but since Sarkt’s arrival, the fishmen avoid the area. A few unfortunate kuo-toas now serve Sarkt as thralls and maintain the illusion that the shrine still serves Blibdoolpoolp.