From Royal Archivist Wiki
Within every sentient, sapient mind exists untapped potential—latent power that most people can only utilize subconsciously and without ever realizing it. This power is known as psionics, and those beings who can use their psionic powers consciously are called psions.
Unlike magic, psionics remains relatively constant and consistent across all worlds. A psion can use his power on any nearly every world without fluctuation in the ease of use or resulting power, although exceptions do exist, such as the Step-inhibiting effects of Austerre and the phantom-activations of Nysa. Certain technologies can dampen or completely disable psions. On the other hand, some technological devices can increase psionic abilities, at least temporarily, allowing non-psions to tap into their subconscious potential.
The ability to consciously utilize psionics and become a psion is a genetic trait that generally runs in families, although very rarely a mutation occurs that allows someone without any known psion ancestors to suddenly manifest the ability. Several general categories of psions exist, each with a variety of related but distinct abilities associated with them. Espers (also called clairvoyants), who possess extra-sensory perceptions that allow them to see across time and space, and telekineticists, who can exert kinetic force at a distance, are the most common psions. Pergressors, who possess the ability to teleport through time and space, are uncommon and highly valued. Telepaths, who can read and sometimes control minds, and psychic chiurgeons, who can heal the minds and bodies of patients with their own psionic powers, are exceedingly rare.