Bene Tleilax, or the Tleilaxu as they were more commonly called, were a group of secretive, genetically altered humans who inhabited Tlulax, the sole planet of the star Thalim. The customs and ethics of the Bene Tleilax led to widespread revulsion by the other cultures of the Known Universe, a reaction that did little to quench the Tleilaxu's hunger to subjugate their rivals.