The Bene Tleilax or Tleilaxu are an extremely xenophobic and isolationist society. Genetic manipulators who traffic in biological products such as artificial eyes, gholas, and “twisted” Mentats, the Tleilaxu are a major power in the Imperium. The race is ruled by a small council of Tleilaxu Masters, whose genetically-engineered Face Dancer servants have the ability to mimic any human. The Masters themselves possess a bland and diminutive appearance. Despite their influence, the Bene Tleilax are universally distrusted and inspire disgust because their products, though desirable, push the limits of the moral proscriptions established by the ancient Butlerian Jihad.