Psi-inhibitor

The psi-inhibitor is a piece of technology which was used by the Terran Dominion's Project Gestalt to control protoss prisoners.

When implanted on a protoss' brain, it prevented them from accessing the Khala or doing anything other than communicate telepathically. They could be controlled at range to change the amount of restriction.

A determined protoss can override their psi-inhibitor under certain circumstances.