Psionics is the practice of using a variety of psychic abilities. Although the evidence of psychic abilities in a controlled setting is not supported by science, believers in psychic phenomena have developed numerous hypotheses on its function. Beliefs on how these claimed abilities work vary greatly.
Psionics, in role-playing games, is a broad category of fantastic abilities originating from the mind, similar to the paranormal psionic abilities that some people claim in reality.
Psionics is the power to alter one's environment through thought. One explanation for this is that psionics works at the quantum level, using the observer effect to affect probability. Realm Replacements