Duel in the Jedi Temple ruins During the Cold War between the Galactic Republic and the Sith Empire , Jedi Master Orgus Din ' s former apprentice and the Padawan Kira Carsen dueled the Sith Lord Tarnis in the ruins of the Jedi Temple . In 3643 BBY , during a mission to rescue the Republic scientist " Doctor Eli Tarnis " from the Black Sun criminal syndicate , Din ' s fomer student — now a Jedi Knight — learned that the scientist was in fact a Sith Lord , and that he had stolen the Planet Prison superweapon in an attempt to unleash it upon the Republic capital of Coruscant . Having located the Planet Prison ' s heat signature in the ruins of the Jedi Temple , the Knight and Kira Carsen raced through the planet ' s industrial sector and fought their way through the Imperial - occupied Temple until they reached the Council chambers . There , in front of a live transmission to Tarnis ' father Darth Angral and Angral ' s three Sith apprentices , the Knight and Carsen battled the traitorous Sith scientist and defeated him . Having watched the Knight cut down his son in front of him , Angral declared an unending war of vengeance upon the young Jedi and the Order as a whole , sparking the Desolator crisis . Using information Tarnis had transmitted to them , Angral ' s apprentices would seize control of the Republic ' s superweapon projects as part of their master ' s crusade against the killer of Tarnis , a conflict that would only end when the Knight defeated Angral aboard the warship " Oppressor " above Tython . Prelude . In 3643 BBY , during the Cold War between the Galactic Republic and the Sith Empire , a young Jedi Knight was sent to the Republic capital of Coruscant by the Jedi Council . The Knight , who was the former apprentice of Jedi Master Orgus Din , and the astromech droid T7 - O1 ' s tried to rescue the Doctor Eli Tarnis from members of the Black Sun criminal syndicate when the scientist was kidnapped from the Senate Building , and the pair learned that Tarnis had been taken to the gang ' s territory . However , when the Knight and T7 - O1 raided Black Sun ' s headquarters to find Tarnis , the two discovered that the doctor was in fact a Sith Lord who had been masquerading as a Republic scientist . Tarnis had stolen the Planet Prison superweapon , a device that supercharged a planet ' s atmosphere and turned it into an enormous ion cannon , and he now planned to activate it on Coruscant . Teaming up with the Padawan Kira Carsen , the Knight tracked Tarnis to the territory of the paramilitary Justicars ' Brigade , and learned that Tarnis had tricked the project research team into bringing him the real prototype before murdering them . From a dying scientist named Jonkan , the two Jedi learned that the device needed time to charge up to full capacity , and that it generated immense amounts of heat while doing so . Thanks to Jonkan ' s information , the Knight and Carsen were able to locate the device in the ruins of the Jedi Temple , which had been destroyed in the Sacking of Coruscant by the Empire over ten years earlier . Since the fastest way to reach the ruins of the Temple was through The Works , the industrial sector of the planet , Carsen led the Knight to the closest access elevator in the Justicars ' Sector . Within The Works , the two Jedi fought their way through rogue droids and Imperial forces in order to venture into the Temple . The duel . Deep within the Temple , the duo found the remains of the High Council Chamber , which was guarded by almost a dozen Imperial saboteurs . After defeating the surprised Imperials , the duo found Tarnis in the chamber itself amidst the tangle of wires , computers , and generators that formed the Planet Prison . The Sith Lord was standing before a holoterminal , deep in discussion with four figures : a Pureblood Sith , a masked humanoid figure , a short robed Human , and a red - robed older Human . The older man , clearly the leader of the four , praised Tarnis on his work , and astonished the two Jedi by calling Tarnis his son . As the Knight and Carsen stormed into the room and confronted him , Tarnis revealed to the intruders the identity of his red - robed father : Darth Angral , the architect of the Sacking of Coruscant , and a personal enemy of the Knight ' s Master . Tarnis also informed the pair the Planet Prison was minutes away from being ready to fire , and that they would not be able to stop it . At his father ' s urging , Tarnis refused the Knight ' s request that he surrender and drew his red - bladed lightsaber . The Sith Lord attacked the two Jedi , dueling them before the holoterminal in clear view of Angral and the others . Unleashing a blast of violet lightning , Tarnis also attempted to choke one of the Jedi , but the other was able to break the Sith ' s concentration by engaging Tarnis with their lightsaber . However , despite Tarnis ' training by his master Lord Praven — one of Darth Angral ' s apprentices and the Pureblood Sith who was watching the fight — and the strength in the dark side he inherited from his father , the Sith Lord was no match for the Knight and Carsen together . Angral was forced to watch as the Knight struck down his son before his very eyes , driving the Sith into a furious rage . Angral declared an undying hatred for the Knight , warning the Jedi that the Sith would receive retribution no matter how many had to die in the process . His companions promised to avenge Tarnis in an attempt to please their master , and warned the Knight that they already controlled the Republic ' s weapon facilities . With a final warning for the Knight to take to the Council , Angral abruptly ended the conversation . Aftermath . Fortunately for Coruscant , the Planet Prison had not yet completed its startup sequence , and the two Jedi were able to disable the device and destroy it . But upon returning to the Senate Tower and speaking with General Var Suthra , the Mon Calamari who had started the Planet Prison project , the two Jedi realized something terrible . Earlier , one of the analysts from the Strategic Information Service , the Republic ' s primary intelligence agency , had decrypted datafiles recovered by the Knight and T7 - O1 from Tarnis ' agents previously . In doing so , she discovered that the files contained information on all of the Republic ' s weapon projects . The SIS had traced a transmission from Tarnis to Angral before the former ' s death containing the project files , and Var Suthra feared the Sith Lord was already making his move . Declaring war on the Jedi in transmissions across all Republic channels , Angral began to seize control of the Republic weapons projects . While the Empire officially disowned Angral and stated that he was no longer acting with their interests , many in the Republic doubted their sincerity . Suthra asked the Jedi to go to Ord Mantell , where his agents had traced the signal to a secret listening post The Knight also took Kira Carsen on as an official Padawan , assuming the role of Carsen ' s teacher at the behest of Grand Master Satele Shan . From there , the two Jedi and T7 - O1 would travel across the galaxy in an attempt to destroy the superweapon projects now under Sith control . The conflict with Angral would only end after the Sith Lord used the Desolator superweapon — a combination of the stolen Republic weapons technologies — to devastate the agriworld of Uphrades . Having successfully tested the weapon , which he had integrated into his personal flagship " Oppressor " , Angral headed to the Jedi Order ' s homeworld of Tython intending to destroy it as well . The Knight and Carsen intercepted Angral ' s ship above Tython and disabled the Desolator before facing their enemy in a duel aboard the warship ' s bridge — a duel that ended with Angral ' s death and the destruction of the " Oppressor " . Behind the scenes . The duel in the Jedi Temple ruins was created for " " , a released by BioWare and LucasArts on December 20 , 2011 . It appears in the Jedi Knight class story mission " Race to the Ruins " , the finale of the Jedi Knight ' s storyline on Coruscant and the Jedi Knight class ' Prologue . After the player discovers that Tarnis has taken the Planet Prison to the Jedi Temple , the player must make their way through The Works , a map accessible by an elevator in the Justicars ' Sector map . As the Jedi Temple taxi pad is only accessible once the player has unlocked the taxi pad at the end of The Works , the player must make their way through The Works to the taxi pad at the far end of the map . Throughout the area , the player must fight rogue droids , which are expanded on in the general mission " Meltdown ! " , and later Imperial soldiers in the second half of The Works and the Jedi Temple map itself . The Imperials ' presence is explained in the Heroic mission " Enemies of the Republic " , where the players must recover a navicomputer from the ruins of the Temple , for which the Imperials are also searching . The mission itself features only one alignment - based choice ; namely , whether to ask Tarnis to surrender or not . Asking for Tarnis ' surrender gains the player fifty light side points , but the other options do not result in any alignment points . Regardless of the player ' s choice , Tarnis will still fall in the duel , and events proceed as they do above . The mission itself introduces many of the main characters for the class ' Act I storyline , and serves as the main event that drives the plot of the next Act . Tarnis ' death causes Darth Angral to declare war upon the Republic , and Act I consists of the player attempting to find and destroy the Republic superweapon projects — or , in the case of Taris , the former Republic scientist Nasan Godera — which have been captured by Angral ' s three apprentices : Sadic , Praven , and Nefarid . The player also receives their personal ship at the end of this mission , as Suthra sends them to Ord Mantell to investigate a Sith base . The duel is briefly mentioned in the 2012 reference guide " " , in the summary of the Jedi Knight class storyline .