Baron Mahadi Harkonnen, is of the powerful and noble house of Harkonnen. Mahadi was conceived by unnamed parents as part of the male Bene Gesserit breeding program. Mahadi was raised on the hidden world known as Chapterhouse by the Reverend Mother Mohiam. Mahadi was trained in the Voice, Petit Perception, Prana-bindu ,Truth Saying, and Simuflow, but when it became time to ingest the spice of agony, Mother Mohaim stopped him possibly knowing Mahadi would not survive the ritualized poisoning. Mother Mohaim had discovered that Mahadi had a special power not known to the sisterhood or Empire, the details of this power was hidden from most Bene Gesserit. Mahadi’s power manipulated the thinking machines, it also strengthened the Reverend Mothers telekinetic powers. Mahadi’s power was essential to strengthening the Acolytes abilities. The Sorceresses of Rossak tells Mahadi of his descendants and why he was conceived by a Harkonnen to be taken by the Bene Gessrit, this outraged Mahadi so he escapes Chapterhouse with Sheeana, aboard the no-ship Ithaca. Mahadi then begins to train the Valkyries for the Superior/Great Honored Matre Murbella to defeat Hellica on Tleilax. Mahadi gain’s rule when returning to Giedie Prime. Mahdi has vowed to the sister hood to protect them from the unknown enemy.

I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past I will turn the inner eye to see its path.
Where the fear has gone there will be nothing.
Only I will remain.