Tharavul

The practice of tharavul was a Klingon act of barbarism against the Vulcan civilization. Vulcans would be taken into the Klingon Empire and lobotomized, with the telepathy sections of their brain removed. With mental growth stunted, the tharavul Vulcans lost their advanced mind rules, becoming little more than humanoid computers, enslaved by wealthy Klingon masters for varieties of menial tasks.

A tharavul named officiated a klin zha match played between  and.