Duel in the Dark Council Chambers ( Kaggath ) This duel took place during the Galactic War . It was the final confrontation between the Dark Lord of the Sith Darth Thanaton and the Sith Lord Kallig . Prelude . When Darth Zash ordered her apprentice Kallig to kill Darth Skotia , Skotia ' s Master , Darth Thanaton , became suspicious of Zash and her deeds . Thanaton detested Zash and soon , he saw Zash and her apprentices as vermin that needed to be cleansed from the Sith Empire . After Zash supposedly died , Kallig took her place and began serving Thanaton . However , Thanaton sought out to kill every follower of Zash and as such , tried to get rid of Kallig . This act would prove to be his undoing . Kallig survived Thanaton ' s many assassination attempts and managed to build a power - base to fight Thanaton ' s forces . Seeing that all his attempts failed even after becoming a Dark Councilor , and after losing various apprentices , Thanaton called out a Kaggath on Corellia to defeat Kallig once and for all . When it became apparent that he would lose , Thanaton fled to Korriban to ask the Dark Council for help . The duel . Darth Thanaton arrived on Korriban and went to the Dark Council Chambers to speak to his fellow Dark Councilors . Kallig arrived soon after and chased after Thanaton . After Kallig defeated Darth Enraj , who allied himself with Thanaton , Kallig entered the Chamber and confronted their nemesis . Thanaton said that Kallig and Zash were corrupt and needed to be rid of . Kallig stated that Thanaton broke the rules of Kaggath and as such is nothing better than his false words . The Dark Council stated that if Thanaton wanted to keep his reputation and honor , he had to defeat Kallig in a duel . They began fighting against each other but after various attacks , Thanaton was on the verge of defeat . Refusing to accept defeat , Thanaton unleashed bolts of Force lightning , but Kallig effortlessly deflected his attacks with but the flick of the wrist . The now desperate Sith Lord used his full powers to kill Kallig , calling Force storms upon his enemy and shooting Force lightning . This was useless against Kallig , who , thanks to the ghosts bound through the Force walk , was able to survive his attack . Thanaton attempted to conjure another Force storm , but Kallig then utilized a powerful Force push that pinned Thanaton against the opposing wall , before releasing him . As his rival looked on with crossed arms , Thanaton drew his lightsaber and charged , only to be forced to his knees by his opponent . Thanaton , heavily injured , crawled to his fellow Dark Councilors . The Dark Council saw that Thanaton was weaker than Kallig and lost the Kaggath . Darth Mortis apologized to Thanaton , before snapping his neck with the Force . Aftermath . As Kallig proved to be the more powerful Sith , the Dark Council granted Kallig Thanaton ' s seat on the Dark Council . Darth Ravage voiced opposition to putting just a Sith Lord on the Council , as usually Darths attain the seat . Darth Marr advised him to be silent , stating that Kallig had earned the position . He then remedied Ravage ' s protest by granting Kallig the title of Darth Nox . With this act , Nox became the master of all the Sith and members of the Sphere of Ancient Knowledge , answerable , along with the rest of the Dark Council , to the Sith Emperor himself . Mortis then adjourned the meeting , advising Nox to return to Dromund Kaas to ensure the fealty of the Sphere of Ancient Knowledge and promised to inform Nox the next time the Dark Council would congregate .