Tleilaxu Master is a rank in the social system of the Bene Tleilaxu. Masters are rated above Face Dancers, and often use Face Dancer mules to do their bidding. The nine Masheikhs who governed Bene Tleilax through the Ruling Council were chosen from the Master ranks. Some known Masters were Hidar Fen Ajidica during the late Corrino Empire, and Dr. Ereboam, who was in charge of the Tleilaxu Kwisatz Haderach project during the reign of Emperor Paul Atreides. Thousands of years later, during the time of the Return of the Honored Matres, there were two known Masters, Tylwyth Waff and Scytale.