Psionics have always been a part of the Dark Sun setting. Within the cultures of Athas psionics are referred to as the Way of the Unseen. They are a utilization of inner power, a blending of the physical and spiritual energies to create fantastic effects.
This is a companion discussion topic for the original entry at https://www.athas.org/news/9c1ec9b6-f883-4a11-8b95-19d303781e38