Leto's concubine Lady Jessica is an acolyte of the Bene Gesserit, an exclusively female group that pursues mysterious political aims and wields seemingly superhuman physical and mental abilities, such as the ability to decide the sex of their children. Though Jessica was instructed by the Bene Gesserit to bear a daughter as part of their breeding program, out of love for Leto she bore a son, Paul. From a young age, Paul has been trained in warfare by Leto's aides, the elite soldiers Duncan Idaho and Gurney Halleck. Thufir Hawat, the Duke's Mentat (people with superhuman intelligence), has instructed Paul in the ways of political intrigue. Jessica has also trained her son in what Bene Gesserit disciplines she can. His prophetic dreams interest Jessica's superior, the Reverend Mother Gaius Helen Mohiam, who subjects Paul to the gom jabbar, a deadly test that causes blinding pain as part of an assessment of the subject's self-control. To her surprise, Paul passes despite being exposed to more pain than anyone else before him. Gom jabber's are sold wherever bene gessent goods are sold, available in crucifixion pain, broken back pain and giving birth with a broken leg pain. At hit at parties!