In the 2006 Brian Herbert/Kevin J. Anderson short story "Dune: Sea Child," Corysta is a Reverend Mother who, out of love for the child, would not hand over to the Sisterhood the baby they had tasked her to conceive. It is taken from her anyway, and as punishment, Corysta is banished to Buzzell to work in the operation harvesting valuable soostones. The Honored Matres later conquer the planet, enslaving the Bene Gesserit there. Corysta nurtures a foundling Phibian until it, too, is taken from her by the Matres when she refuses to tell them the secret location of Chapterhouse.
When Murbella's forces retake Buzzell in Hunters of Dune (2006), Murbella shares minds with Corysta, learning all she can about the situation on Buzzell but also experiencing Corysta's past. She recognizes Corysta's value and loyalty and puts her in charge of the soostone operation. Corysta manages to improve the efficiency and output of the operation, which is the Sisterhood's only source of revenue besides melange and is essential to their plan to amass arms for a final battle with the Unknown Enemy.
Read more about this topic: List Of Dune Bene Gesserit