Erlik Khan is an Old One, who has five arms on each side, of which four pairs are of much smaller than the main pair. He is able to animate the dead, can cross dimensional barriers, and is able to teleport.
Sometime in the past, the Ancient One was able to imprison him. During the late 20th century, upon the weakening of the mystical barriers protecting Earth, he sent his servants the Khats to Earth. Who then confronted Dr. Strange and his servant Wong.