Bene Gesserit
Although Irulan is noted to have been "trained in the deepest of the Bene Gesserit ways, destined to be a Reverend Mother", in the series she never undergoes the dangerous ritual spice agony to achieve this. In "Dune Messiah" she is noted to have been "well trained for a task at which she had failed, a flawed Bene Gesserit creation". Of Irulan Lady Jessica says in "Children of Dune": "Irulan had never been the most accomplished adept in the Bene Gesserit—valuable more for the fact that she was a daughter of Shaddam IV than for any other reason; often too proud to exert herself in extending her capabilities."