Schwangyu came into conflict with Reverend Mother Lucilla and Bashar Miles Teg regarding the training of the present Duncan Idaho ghola. She believed that the ghola was too dangerous a weapon for the Bene Gesserit to wield. As a result, she betrayed Teg, the ghola, and the Bene Gesserit sisterhood by permitting the Bene Tleilax to attack and destroy the Gammu keep in order to capture the ghola. However, Teg, Lucilla, and the ghola managed to escape, while Schwangyu was killed in the attack.
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