original_query: Who are the Tleilaxu and what role do they play in the assassination attempt on Leto II Atreides?
query: Who are the Tleilaxu and what role do they play in the assassination attempt on Leto II Atreides in the Dune series?
answer: The Tleilaxu are a xenophobic and isolationist society of genetic manipulators in Frank Herbert's Dune universe. In *God Emperor of Dune*, they orchestrate an assassination attempt on Leto II Atreides by using Face Dancers to replace nearly everyone in the Ixian embassy on Arrakis.