The word Kralizec does not appear in the Dune saga until the book Children of Dune. It is spoken of both as a terrible fate waiting for humankind in its future and as a rite of passage for the species, an inevitability that would test humankind to its limits but, in the end, leave them with the ability to survive indefinitely within an often malignant universe. Paul Atreides Jihad killed more than 60 billion humans, but the price of Kralizec would be far greater.
This video of course will contain spoilers for the book: God Emperor of Dune. Of the many great and powerful Dukes, Barons, and Emperors of the Dune Universe, none have had more impact than the God Emperor, Leto II. His eventual powers would dwarf those of even his father, Paul Atreides. His influence outgrew the guild, all of CHOAM, even the Bene Gesserit. The great houses of the Landsraad were rendered irrelevant. He controlled the flow of spice throughout the universe, and no one moved throughout his empire without his knowledge. His prescient eye reached to the furthest reach of time, almost nothing was hidden from him. He was the most powerful human being who ever lived, by far. And the most oppressive imperial dictator of all time, never before had the whole of humanity been held in such a tight grip.
But even he was vulnerable. The God Emperor Possessed secrets. These hidden vulnerabilities are ultimately the key to his undoing. The first of the God Emperor’s Secret’s which Duncan Idaho was supposedly put in charge of maintaining, was simply the fact that he was vulnerable. He was not truly a god as many throughout the human universe truly believed, he could be harmed, he could be killed.
The fish speakers were Leto II’s military force during his reign as God Emperor of the Imperium. Finding that the Fremen and Sardaukar were unable to suit his needs, Leto Founded his all-female fish speaker army. The Fish Speakers were the enforcers of Leto’s peace, which was necessary for the golden path. The Fish speakers are the most effective military force in the history of the dune universe in terms of the length of its operation and the number of world they ruled.