“The multiverse is thought, not matter”
This discipline is the most ancient and mysterious of all the psionic disciplines, and the one that, among the profanes, is often assimilated as the psionic art as a whole.
Telepathy is the ability to connect two minds across unlimited distances, where one mind, the stronger, can modify the psychic pattern of another mind to produce effects that even magic cannot.
Among all the psionic disciplines, telepathy is considered the most invasive and dangerous. People do not react well when dealing with a telepath, including other psionicists.
The very fact that telepathy produces effects in the mind, and that the psionicist using his power does not need to move or speak any word, is objectively a terrifying thing.
Your mind can be dominated, driven crazy, or wiped out by an unseen force coming from an unknown enemy.
Psionic Powers – Mind over Matter
Have a look at the preview on DrivethuRpg to know more about the Psionic Experiment.