As related in God Emperor of Dune (1981), Syaksa sends Chenoeh and Tawsuoko to Arrakis on a fact-gathering mission in 13,725 A.G. Her warning to Chenoeh that "You must do nothing which will bring down his wrath upon us" encourages Chenoeh to obey the God Emperor's command to withhold certain of his statements from the Sisterhood. Syaksa and four other Reverend Mothers (Yitob, Mamulut, Eknekosk and Akeli) incorporate information gleaned from this mission into an "assessment of the state of the Empire" for that year (before the subsequent assassination of Leto II). Syaksa believes that the religious character of the Fish Speakers is slowly being devolved under Leto II. She further attributes to him a motive based on the concept of hydraulic despotism, in which a government structure maintains power and control through exclusive control over a basic resource needed to live (in this case, melange), proposing that he is building the Empire toward an even greater dependence on the spice.
Read more about this topic: List Of Dune Bene Gesserit