Mission to Coruscant ( Desolator crisis ) During the Cold War between the Galactic Republic and the Sith Empire , a young Jedi Knight — the former apprentice of Jedi Master Orgus Din — was sent on a mission to the Republic capital of Coruscant to investigate a dark presence there . Accompanied by the astromech droid T7 - O1 , who had helped the young Jedi put a stop to the recent Flesh Raider uprising on the Jedi Order ' s homeworld of Tython , the Knight worked with the Republic Strategic Information Service and the Coruscant Security Force to stop the Sith Lord Tarnis from activating the Planet Prison superweapon . After a gang of thieves stole the design files for the Planet Prison from a military warehouse on Coruscant , the Strategic Information Service tracked the thieves back to the criminal organization known as the Migrant Merchants ' Guild . The newly - arrived Jedi Knight and T7 - O1 were immediately sent to recover the files , but Doctor Eli Tarnis — the Planet Prison ' s designer and secretly a Sith Lord who had been undercover as a Republic scientist — orchestrated his own kidnapping by his allies in the Black Sun criminal syndicate so that he could proceed with his plans . Chasing the kidnappers to the Coruscant Spaceport , the Padawan Kira Carsen and the CSF were aided by the Knight in retaking the hangar where the criminals were holed up , and discovered that the kidnappers were actually a decoy . Tarnis had retreated to the territory of the paramilitary Justicars ' Brigade , but the Jedi unknowingly followed another false lead into Black Sun Territory in a vain attempt to rescue the scientist . After staging a successful assault on the syndicate ' s headquarters with the help of an elite CSF team , the Knight failed to find Tarnis — but instead discovered Tarnis ' true identity and his plans for the Planet Prison . As the Republic scrambled to secure their other jeopardized weapon projects from the Empire , Carsen and the Knight tracked Tarnis to the Justicar ' s Sector , only to find that he had murdered the Planet Prison design team and stolen the superweapon after tricking them into bringing it to him . With the help of a dying scientist , the two Jedi traced the Planet Prison ' s signal to the ruins of the Jedi Temple , and they confronted the Sith Lord in the depths of the damaged edifice . Tarnis , who revealed his identity as the son of the Sith Lord Darth Angral , battled the pair in a fierce duel before holograms of his father and Angral ' s apprentices as the Planet Prison inched ever closer to activation . To Angral ' s fury , the duel ended with the death of Tarnis at the hands of the Knight , and the Sith Lord would embark on a crusade of vengeance against the entire Republic in response . Prelude . The events on the planet Coruscant had their beginnings in the last days of the Great Galactic War between the Galactic Republic and the resurgent Sith Empire . The Empire deceived the Republic with sham peace negotiations on the Core World of Alderaan while they attacked the Republic ' s capital in what would become known as the Sacking of Coruscant . After a strike team led by Sith Lords Darth Malgus and Adraas destroyed the Jedi Temple and took down the planet ' s defense grid , massacring a great number of Jedi in the process , the Sith Lord Darth Angral held the capital hostage with an invasion fleet . The Empire then forced the Republic into signing the Treaty of Coruscant , requiring the Republic to withdraw its forces from across the galaxy and beginning an uneasy peace known as the Cold War . The Jedi Order migrated to their recently rediscovered homeworld of Tython , where they rebuilt their numbers amidst scattered attacks by the native Flesh Raider s . These attacks would take on a sinister purpose in the year 3643 BBY , when it was discovered that the Nautolan Dark Jedi Bengel Morr was manipulating the natives against the Order in an attempt to destroy the Jedi . The former apprentice of Jedi Master Orgus Din , Morr had been inside the Temple on Coruscant during Malgus ' attack and was presumed dead when his body was not recovered . However , he had actually escaped the attack and subsequently went insane , turning to the dark side of the Force and blaming the Jedi for submitting to the Sith . Morr ' s Flesh Raider forces began to attack the Jedi in an attempt to destroy them , but Din and his newest apprentice uncovered the Dark Jedi ' s plans and put a stop to them . For rescuing Din from his former student and defeating Morr with the help of a Jedi astromech droid designated T7 - O1 , Din ' s Padawan was elevated to the rank of Jedi Knight by Grand Master Satele Shan and sent to Coruscant with T7 - O1 and Din . The agents of the Empire were also busy during the decade following the Treaty , however . Angral ' s son Tarnis , who was trained in the ways of the dark side by Angral ' s own apprentice Lord Praven , entered into an undercover mission on the Republic capital itself . Under the alias " Eli Tarnis , " he masqueraded as a Republic scientist and inserted himself into the development team for the Planet Prison superweapon , where he gathered information on the Republic ' s weapon projects . The Planet Prison was one of many weapons projects started by Mon Calamari General Var Suthra in honor of the Jedi killed during the destruction of the Jedi Temple , and by 3643 BBY the weapon was in prototype stage . The mission . Deception . Around that time , the Jedi High Council had become concerned about a seemingly dark presence that they could sense on the capital even all the way from Tython in the Deep Core . The Council had dispatched Jedi Master Bela Kiwiiks and her Padawan Kira Carsen to Coruscant during the war with the Flesh Raiders in order to investigate , and Tarnis sensed that his mission was in jeopardy . Therefore , he approached Salarr , the leader of the Black Sun criminal syndicate , and revealed his true identity as a Sith Lord . In exchange for Imperial weapons and technology acquired through Tarnis ' contacts in the Imperial - friendly Justicars ' Brigade paramalitary group , Black Sun would help the Sith in the elaborate deception he was about to perpetrate . At Tarnis ' request , Black Sun sent a team of thieves led by the Rodian Vistis Garn — who often worked for Black Sun ' s rival , the Migrant Merchants ' Guild — to raid a military warehouse in order to steal the design files for all of the Republic ' s superweapon projects . The raid was successful , and Garn ' s team made off with the files and a shipment of advanced weapons and munitions , but the Rodian was caught on a security camera as the group was departing for the Guild - controlled Old Galactic Market . Tarnis planned to take the stolen files with him back to the Empire , but also intended to strike a blow against the Republic before leaving . Agent Galen of the Republic Strategic Information Service , the Republic ' s primary intelligence agency , was ordered to head the search for the stolen plans , and his office worked collaborated with the Coruscant Security Force in their efforts . Thirty - two hours later , General Suthra met with Din , Kiwiiks , Carsen , and Tarnis in Conference Room 2 - Aurek in the Senate Building to discuss the status of the security breach , and they were soon joined by Din ' s former apprentice and T7 - O1 . Tarnis was irritated that the Jedi disapproved of the Planet Prison weapon — as it ionized a planet ' s atmosphere , thus blockading a world and preventing any ships from leaving or arriving , it was a humane method of warfare that he believed the Jedi should favor . During the discussion , Galen ' s subordinates had identified Garn as one of the thieves and tracked him to the Old Galactic Market , causing the agent to interrupt the meeting with the news . Leaving Galen to work with the Knight and Carsen on the search , Suthra departed with Kiwiiks and Din in order to meet with Supreme Chancellor Dorian Janarus aboard the official ' s personal flagship , the " Founder " , above Coruscant . Recovery attempts . Tarnis remained behind as the two Masters departed with Suthra , and Galen gave his report to the Knight and Carsen . By that time , the SIS had tracked Garn back to the Old Galactic Market with the aid of the Coruscant Security Force , and the Knight immediately departed for the Guild ' s territory with T7 - O1 while Carsen and Galen worked to distract the gangsters with the CSF ' s security network . Arriving in the Market , the Jedi and T7 - O1 fought their way into the heart of the region and raided the warehouse where Garn was holed up . The Knight made short work of the Rodian ' s crew and stormed the secure vault into which Garn had retreated , defeating the autoturrets that the thief had set up . Interrogating Garn , the Jedi learned that Black Sun had hired him , and that a copy of the now - decrypted plans had already been sent to the gang . Following the Knight ' s departure , Tarnis put the second part of his plan in motion by signalling a Black Sun " kidnapping " team led by the Human Zeer . With inside information supplied by the Sith Lord , the criminals infiltrated the Senate Building and made off with the scientist before they were detected by Senate Security . As part of their arrangement , Zeer and his men fled to the nearby Coruscant Spaceport to serve as a distraction so that Tarnis could escape to Black Sun Territory — but the Sith Lord instead chose to head to the Justicars ' Sector in order to continue his plans . When the SIS and Senate Security realized what had transpired , Galen dispatched a CSF team under Carsen ' s leadership to the spaceport to retrieve the doctor and ordered the Knight to return immediately when the second Jedi contacted the agent to report the outcome of the raid . Allowing Garn to leave in peace in exchange for the information , the Knight recovered the other stolen weapons and left them to be taken into custody by the CSF forces in the area before returning to the Senate Building . There , the Jedi and T7 - O1 were briefed on the situation and sent to the spaceport to reinforce Carsen and the CSF , who were in a stalemate with the Black Sun gang . The two Jedi were able to break the criminals ' lines through the Knight ' s combat prowess and Carsen ' s use of a borrowed SIS stealth field generator , confronting Zeer and quickly defeating him . Carsen convinced Zeer to tell them where the doctor had been taken by pretending to read his mind and terrifying the criminal , and the two Jedi left the Black Sun members to the CSF as they returned to the Senate Building . There , they found that Galen ' s analysts had read through the recovered data files and discovered that they contained information on all of the Republic ' s superweapon projects . Suthra , having returned from the meeting with the Chancellor , was worried about the safety of the facilities , so Kiwiiks and Din agreed to each secure one of the three off - world projects . Agent Galen departed as well to secure the third facility , but before leaving he told the Knight to make contact with Sergeant Nidaljo of the CSF ' s special tactical unit in Black Sun Territory . Galen contacted Nidaljo as he was heading to his ship , and the special tactical unit attempted to set up a perimeter around Black Sun ' s headquarters for the upcoming mission to rescue Tarnis from the structure . However , the gang had attacked with advanced weapons and armor , killing half a dozen of Nidalgo ' s men and forcing the unit to retreat into an abandoned building . It was there that the Jedi and T7 - O1 found Nidaljo and his men trapped behind a hastily erected barricade , pinned down by heavily armed Black Sun members , and the Knight quickly dispatched the criminals . The police officer was ready to give up hope , but the Knight reminded him of his duty and how the fallen members of his squad had given their lives to aid the man trapped inside the enemy headquarters . Inspired by the Jedi , the entire unit rallied to the Knight ' s call to arms and prepared to launch their attack . Nidaljo ' s men targeted the rear entrance of the compound , while the Knight and T7 - O1 stormed the front entrance and reached the central room first — where the pair were astonished to discover that Tarnis was not present in the building , but was in fact speaking with Salarr , Black Sun ' s leader , via a holotransmission . A traitor revealed . Listening to Salarr ' s angry exchange with Tarnis , the Knight learned that the entire affair had been staged — Tarnis had hired the criminals to steal the files and kidnap him . When the Jedi accused the scientist of treason , Tarnis revealed that he was in fact a Sith Lord , and ended the transmission after informing Salarr that his services were no longer required . Furious , Salarr turned to confront the Jedi , but Nidaljo ' s unit burst into the room at that moment and shot the Black Sun member who was sneaking up on the Knight . Together , the CSF and the Jedi fought and defeated Salarr ' s men , striking down the syndicate ' s leader and dealing a crippling blow to Black Sun ' s operations . While Nidaljo ' s men retreated to a safer location and the Knight returned to the Senate Building , Tarnis began to put the third stage of his plans in motion . Upon arriving in the Justicars ' Sector , he contacted his research team and informed them that the Jedi were planning on shutting down the Planet Prison project . Imploring them to do the right thing for the Republic , he convinced the scientists to bring the prototype to him in the Justicars ' Tower . But when the team arrived , Tarnis turned on them and massacred his subordinates before taking the prototype deep into the ruins of the Jedi Temple . Back in the Senate Building , General Suthra was both furious and horrified that a Sith had infiltrated his people so easily , and when Carsen traced Tarnis ' holotransmission to the Justicars ' Sector , he immediately dispatched the two Jedi to recover both the prototype and the research team — whom he also suspected were traitors . But once the two Jedi fought their way to the source of the transmission , they found the bodies of the research team and realized the truth . One scientist , a man named Jonkan , was still alive , and with his last breaths he managed to tell the Jedi that the Planet Prison required time to charge and how it generated immense amounts of heat while doing so . Using that information , Carsen located the Planet Prison in the Jedi Temple , and the two Jedi raced through the industrial sector known as the Works to reach the Temple . Fighting through Imperial strike teams searching for lost information amidst the ruins , the Knight and Carsen finally located Tarnis in the chambers of the Jedi Council . Having set up the machinery of the Planet Prison in the chamber , Tarnis was using the Temple ' s own power grid to charge the superweapon while he conversed with four holograms . Listening to the conversation , the Knight and Carsen were shocked to discover that the people were Darth Angral and his apprentices , Lords Sadic , Nefarid , and Praven ; but they were more astonished to hear Tarnis call Angral " father . " Approaching the Sith Lord , the Knight asked Tarnis to surrender peacefully , but the older man was egged on by both his father and Angral ' s apprentices so that he charged the two Jedi , unleashing a blast of violet lightning . The three engaged in a fierce duel before the holoterminal , and Angral watched in horror and fury as his son was slowly beaten back and finally struck down by the Knight ' s lightsaber . Consumed by anger and grief , the elder Sith Lord declared undying hatred upon his son ' s killer , and promised the Knight that he would exact his revenge even if it meant destroying the entire Republic . After Angral ended the communication , the Knight and Carsen inspected the Planet Prison . They found that it was not yet fully charged , and the two Jedi were able to disable it and return to the Senate Building safely . Aftermath . While the crisis on Coruscant ended with the deactivation of the Planet Prison , the mission would have far - reaching consequences . True to his world , Angral embarked on a crusade against the Knight , including both the Republic and the Jedi Order in his mad quest for revenge . Sending his apprentices and agents to various worlds , he took advantage of his son ' s information and seized control of the Republic ' s superweapon projects , combining them into a ship - mounted world - killer weapon known as the Desolator . Traveling with T7 - O1 and Carsen , who was made the Knight ' s official Padawan by Grand Master Shan , the Jedi battled Angral ' s apprentices and Imperial Intelligence in order to destroy the stolen superweapons before they could be used against the rest of the galaxy . The trio finally faced Angral aboard his flagship , the " Oppressor " , above Tython after the Sith Lord used the Desolator against the Republic agriworld of Uphrades . Together , the Knight and Carsen were able to strike down the Sith and end the crisis . Behind the scenes . The mission to Coruscant appears in " " , a released by BioWare and LucasArts . The mission represents the in - universe events of the Jedi Knight class ' Prologue on Coruscant , which is divided into six in - game missions : " The Jedi Envoy , " " Stolen Secrets , " " Kidnapped ! , " " The Rescue , " " Tracking Down the Traitor , " and " Race to the Ruins . " As it is the Prologue of the class storyline , the mission sets up the storyline of Act I , and introduces many characters who appear later throughout the game . Kira Carsen is gained as a companion at the end of the planet storyline , and General Suthra sends the player to various planets throughout Act I . Bela Kiwiiks will later be encountered on Tatooine , Orgus Din on Alderaan , and Agent Galen on Nar Shaddaa , where they have all been captured or otherwise impaired by the Sith . Angral ' s apprentices are also introduced in the confrontation with Tarnis , and they serve as the main enemies on Tatooine , Alderaan , and Nar Shaddaa . The player is first sent to Ord Mantell to recover information on Angral ' s plans , and on Taris the Knight attempts to rescue the scientist Doctor Nasan Godera from Watcher One of Imperial Intelligence . As a Republic player , the Knight is assumed to make only light - side decisions throughout the course of the game , although most details of the storyline are consistent across all alignment options . Regardless of player choice , Tarnis and Salarr will both die , though both Vistis Garn and Nidaljo can be handled differently . Vistis Garn can be killed for dark side points , and Nidaljo can be forced to aid the player through a mind trick , although this also results in dark side points . The mission is also summarized in the 2012 reference book " " , during an overview of the Jedi Knight class ' storyline .