Terrak Morrhage Terrak Morrhage was an ancient male Sith Lord who specialized in the scientific arts , creating a plague which nearly wiped out the ancient Jedi Order . Biography . Plague Master . A Force - sensitive Humanoid , Terrak Morrhage trained as a Sith at the Academy of Sigil where he specialized in scientific applications of the dark side of the Force . Purposefully tasting poisons to build up a tolerance , Morrhage was taken under the tutelage of a female Sith Lord who was determined to see him rise to greatness . Working from his master ' s laboratory , the pair began developing terrible hazards for use against their greatest enemy : the Jedi Order . During his training , his master fled Sigil in fear that the Jedi Order was searching her out . Ultimately , the Jedi found the Sith woman and killed her , retracing her trail back to Sigil and burning her laboratory to the ground . Escaping the assault , Morrhage was enraged by the loss of such wisdom and vowed revenge . Decades after his master ' s death , Morrhage developed a plague of terrible power , designed to expose the Order ' s hypocrisy by turning its members to the dark side and making them Morrhage ' s thralls . As Morrhage infected more and more Jedi , they suffered paranoia and psychosis as the Sith Lord leached their powers and used them to increase his own strength . Amassing a huge army of thralls , Morrhage launched a war against the Jedi Order which threatened to decimate the Sith ' s sworn enemies . Despite the strength of his armies , Morrhage was undone by a Jedi healer who developed a shielding technique that cut Morrhage off from his victims and allowed them to think on their own again . While the healer died in the process of freeing Morrhage ' s thralls , they recorded the ritual for other Jedi to learn and eventually Morrhage was defeated . Killed in battle , Morrhage ' s servants entombed his body on Malachor III within an ancient temple where he would lie undisturbed for millennia . Becoming Lord Vivicar . Long after his death , Morrhage ' s tomb was disturbed by the modern Jedi Order of the age . During a time of galactic turmoil known as the Great Galactic War , the Jedi Order dispatched a taskforce of Jedi Knights to Malachor III to investigate the world . Jedi Parkanas Tark , Yuon Par , Duras Fain , Sidonie Garen , Eriz Vossan and Cin Tykan began searching the tomb for ancient records or scrolls when Morrhage ' s spirit awoke and began to play with the emotions of the young Jedi and drove them into a frenzy of lust and passion . While the rest of the team managed to escape to planet , Jedi Tark was left behind to be tortured by Morrhage and , eventually , Morrhage ' s dark spirit corrupted and possessed him . Leaching off of Tark ' s youth and strength , Morrhage dubbed himself Lord Vivicar and began to exact his revenge on the Jedi Order by lashing out at the Jedi who had abandoned Tark on Malachor III . These Jedi began suffering a psychosis unknown to the Jedi of the era and quickly became violent . Eventually , they were stopped by the actions of a lone Jedi Consular who had uncovered the ancient shielding technique from records kept with the Coruscant Jedi Temple ' s Archives . Defeated , Morrhage warned the Consular that should Tark die , all the Jedi Masters afflicted by the plague , shielded or not , would die with him and attempted to goad the Consular into striking him down . The Consular instead chose another option and used the shielding ritual to exorcise Morrhage from his host . Screaming with rage , Morrhage swore he would gather his strength and revenge himself upon the Consular before disappearing , releasing Jedi Parkanas Tark from his thrall .