Bene Gesserit
In "Chapterhouse: Dune", Duncan and Murbella's mutual imprinting has made them reluctant lovers. Murbella collapses under the pressure of training and her pregnancy, but realizes that she admires and wants to be Bene Gesserit. Murbella submits to the spice agony to become a Bene Gesserit Reverend Mother and survives. During a Bene Gesserit attack on the Honored Matres, Murbella kills the Great Honored Matre Logno with her Bene Gesserit-enhanced fighting skills, and the Honored Matres are awed by her physical prowess. The Bene Gesserit Mother Superior Darwi Odrade is also killed, and Murbella secures the leadership of both groups, per Odrade's plan. Murbella intends to merge the two orders into a New Sisterhood, which displeases some of the Bene Gesserit. The dissenters flee Chapterhouse with Duncan, Miles Teg, and Sheeana in a giant no-ship, and Murbella realizes their plan too late to stop them.