is known The planet is generally described as having been a satellite of Delta Pavoms and was destroyed, by cause or causes unknown, m the early 6800s ISHIA En route to Ishia, tire refugees from Rossak were given a comprehensive explanation of what had happened to the segment of their people who had been out of reach for so long The Guildsmen spoke as little as possible of die centuries on Salusa Secundus, and the Zensunm, who sensed that there was much here best learned from their own, did not press them for details What the Guildsmen did describe, at great length, was the planet to wtoeh the survivors from those centuries had been sent Ishia, they explained, was the opposite of Rossak hot, and, it oppressed its life forms with heat as Rossak did with cold Those crops which survived did so only because of tremendous amounts of time and energy spent in careful irrigation The system had to be constantly watched, as a single day's deprivation could kill a field The Zensunm on Ishia had come from a tougfier environment than that which faced them Even so, adapting was difficult for them They were not accustomed to the workings of a desert ecology, and becoming accustomed to them cost heavily in the beginning Once the period of adjustment was finished, however, the Zensunm had done well By reverting to many of the ways of their ances tors from the time of the nomadic tribes, the Ishia ZensuRm had learned to live with/the desert instead of struggling against it, and they throve where it was once believed a colony would barely be able to eke out an existence The Rossak Zensunm listened gravely, but were not frightened What one segment of their people could do, surely another could do, too One of their number, on being told that the group might have more difficulty than they expected in learning to live on their new world, made so bold as to voice this belief ' 'Ah, but you do not understand me yet, one of the Guildsmen is quoted as saying (in Kuuan's Monuments) "You are not going to Ishia, but to the world for which Ishia was your people's training ground "A world called Arrakis ARRAKIS In 7193, then, all of the known Zensunm m the Impenum were transported to Arrakis This last relocation orgam/ed in deep secret by the Spacing Guild, served the purposes of both sides involved It gave the Zensunm a home, on perhaps the only world in all the Impenum (with the exception ot the Guild sanctuary world of Tupile) where they would be too difficult to dig out for the emperor or his Sardaukar to bother trying And it gave the Spacing Guild a permanent entree to Arrakis The Guildsmen wanted such an arrangement because of the spice melange, found only in the Arrakis desert Similar to but infinitely more powerful and subtle than the poison drug the Zensunm had discovered on Rossak, melange was essential to the Guild's interstellar travel monopoly It was m the best interests of the Guild to control a supply of melange through a grateful nat