The mind rack, a Rakatan invention, enabled a user to focus their Force powers. However, this came at a steep price, inflicting intense agony and potentially resulting in death. Back in 25,793 BBY, Predor Skal'nas utilized a mind rack on Force Hound Xesh, who was briefly under his command from his master Tul'kar. Skal'nas's goal was to have Xesh project his Force shadow into the Deep Core of the galaxy to discover the whereabouts of Tython, a world abundant in the Force.