and thus total control of its use). Personal violence of any kind is banned, as is nearly all space travel, creating a pent-up demand for freedom and travel. The Bene Gesserit, Ixians, and Tleilaxu find themselves seeking ways to regain some of their former power or unseat Leto altogether. Leto also conducts his own selective breeding program among the descendants of his twin sister Ghanima, finally arriving at Siona, daughter of Moneo, whose actions are hidden from prescient vision. Leto engineers his own assassination, knowing it will result in rebellion and revolt but also in an explosion in travel and colonization. The death of Leto's body also produces new sandtrout, which will eventually give rise to a population of sandworms and a new cycle of spice production. The return from the Scattering In the aftermath of the fall of the God Emperor, chaos and severe famine on many worlds cause trillions of humans to set off into the freedom of unknown space and spread out across the universe. This diaspora is later called the Scattering and, combined with the invisibility of Atreides descendants to prescient vision, assures that humanity has forever escaped the threat of total extinction. At the time of Heretics of Dune (1984) and Chapterhouse: Dune (1985)—1500 years after Leto's death—the turmoil is settling into a new pattern; the balance of power in the, as it is now called, Old Empire rests among the Ixians, the Bene Gesserit, and the Tleilaxu. The Spacing Guild has been forever weakened by the development of Ixian machines capable of navigation in foldspace, practically replacing Guild Navigators. The Bene Gesserit, through manipulation of the Priesthood of the Divided God, control the sandworms and their planet, now called Rakis, but the Tleilaxu have discovered how to produce melange using their axlotl tanks in quantities that greatly exceed natural melange harvests. This balance of power is shattered by a large influx of people from the Scattering, some fleeing persecution by an as-yet unknown enemy. Among the returning people, the Bene Gesserit finds its match in a violent and corrupt matriarchal society known as the Honored Matres, whom they suspect may be descended from some of their own sent out in the Scattering. As a bitter and bloody war erupts between the orders, it ultimately becomes clear that joining the two organizations into a single New Sisterhood with shared abilities is their best chance to