The Mule is one of the greatest conquerors the galaxy has ever seen. He is a mentalic and partial telepath, who has the ability to reach into the minds of others and "adjust" their emotions, individually or en masse, using this ability to conscript people to his cause. Not direct mind control per se, it is a subtle influence of the subconscious; persons under the Mule's influence behave otherwise normally - logic, memories, and personality intact. This gives the Mule the capacity to disrupt Seldon's plan by invalidating Seldon's assumption that no single individual could have a measurable effect on galactic socio-historical trends on their own, due to the plan relying on the predictability of the actions of very large numbers of people. He sometimes uses the musical Visi-Sonor to amplify these abilities.