Battle in the Imperial Security Bureau This battle was a rescue mission that dissolved into an utterly chaotic encounter . Prelude . Jedi Knight Jax Pavan had arranged a plan with I - 5YQ and the rest of his companions , first proposed by Tuden Sal , to assassinate the Emperor . The theory behind the plan was that as I - 5YQ was a droid , his intentions would be unreadable in the Force , and he would be able to sneak up on Palpatine and kill him before the Emperor could react . After much infighting on whether or not to adopt the dangerous plan , Jax and his friends finally decided to try it . Change of Plans . For a long time , Darth Vader had been hunting down Jax Pavan . A Zeltron named Dejah Duare had joined Jax ' s group of friends in the organization called Whiplash . The Zeltron enjoyed the affects of feeling the Force . Pavan , however , shut himself away from her . She experienced the opposite with an Imperial Inquisitor named Probus Tesla , and she betrayed Pavan . Laranth Tarak was taking Kajin Savaros to the Whiplash headquarters when they were ambushed and captured by Imperials . Darth Vader tortured Laranth and had Kajin ' s mind wiped . He then turned Kajin against the Jedi , making him believe that he was Sith . When Jax heard about Laranth and Kajin ' s capture , he declared that their assassination mission had turned into a rescue mission . Jax discovered that Laranth was being held in the ISB Central Office . After consulting with the Whiplash , Jax contacted Vader and proposed a trade . They would hand over I - 5YQ , who was also a target of Vader ' s , in return for Laranth Tarak . Confrontation . I - 5YQ was escorted into the building by Dejah Duare and Haninum Tyk Rhinann . They were met by three Inquisitors who took them to the detention center where Laranth was being kept . Waiting for them there was Darth Vader , Kajin Savaros , and Emperor Palpatine himself . I - 5 , however , did not attempt to shoot the emperor , and Palpatine disappeared , as he was just a hologram . Vader then asked Dejah which one of them had the bota . She admitted that she did not know , but suggested that perhaps I - 5 had given the vial to the Jedi . She turned to one of the Inquisitors , who was really Jax in disguise . Jax and his friends were shocked at her betrayal , and she revealed that she did not betray them because of politics or for personal reasons , but because she enjoyed feeling the Force , and that Inquisitor Probus Tesla did not have the same moral restrictions as Jax did , that kept them from truly touching each other . Bota . Vader demanded the bota from Jax , but the Jedi Knight didn ' t have it . Vader told Jax to make I - 5 give him the bota . I - 5 replied that he didn ' t have it , and then shot his lasers at Vader . Vader , however , sensed the droid ' s intentions through the Force , proving that I - 5 had become somewhat sentient , and was able to deflect the shots with his hand . When nobody would hand over the bota , Vader Force - slammed Jax against a nearby wall . Laranth finally gave in and revealed that she had the bota . Vader took it , and then made Jax hand over the pyronium nugget he had given him long ago . He then asked for Darth Ramage ' s holocron , the Sith holocron that had information on how to combine the effects of pyronium and bota . But Jax no longer had the holocron . Vader said that it did not matter , and decided to take the bota anyway , injecting the serum into himself via the receptacle on his chest plate , despite a last - second protest from Tesla . Chaos . For a moment , the bota did not seem to affect Vader hardly at all . Then he suddenly lost control of himself . Jax decided that this was the time to attack Vader , and he activated his lightsaber . Vader , however , began hurling Force energy in all directions , completely out of control . One of his shots sent a durasteel frame down on I - 5 , trapping the droid . Another hit the EMP field that had been scrambling Laranth ' s Force - sense . Now free , she moved to protect Kaj . Everybody ran for cover except for Dejah , who loved experiencing the Force . Before long she was hit by one of Vader ' s blasts of Force energy and smashed against the wall , dead . Another blast hit the second inquisitor , killing him as well . Laranth attempted to use the Force to cloak Vader , but to no avail . I - 5 began to use his lasers to to work his way free of the door . Jax moved cautiously towards the Sith Lord , but Probus Tesla blocked his way and engaged him in a duel . Tesla was then glanced by one of Vader ' s blasts and was knocked away . Jax then attacked Vader with his lightsaber , but the blow just ricocheted off the Force that cocooned the Dark Lord and the lightsaber flew out of Jax ' s hand as he was knocked to the ground . Just then a Whiplash strike team led by Thi Xon Yimmon came rushing in . Tuden Sal was one of the members , and he tried to get Kajin to safety , but the boy broke free and charged toward Vader . Vader roped him with the Force and sent him flying toward an open window . Jax moved to help the boy , but Vader lassoed him with the Force as well . Rhinann , who had been watching from cover , could not stand to see Vader use up the last of the bota . His last chance to touch the Force was disappearing before his eyes . He attacked the Dark Lord , jumping on him and trying to tear apart his breathing apparatus . Vader lost his hold on Jax and Kajin , and stumbled out the window with Rhinann in tow . They hit the ground after a long fall , and for a brief moment , Rhinann touched the Force , feeling it rush through him as he died . Back in the control room , Jax noticed that Tesla had disappeared . There was a burst of Force energy from the hangar and the building began to blow up . Jax quickly collected the pyronium and his lightsaber and rushed to safety . Aftermath . After the encounter , Jax and Laranth contemplated many things , and Jax wondered whether or not Vader was indeed Anakin Skywalker . Den Dhur , who was a member of the strike team that had come to their rescue , rejoined Jax and his friends , and the group went back to their work with Whiplash . Darth Vader and Probus Tesla both survived , though what became of Tesla afterward is unknown . Behind the scenes . This battle was created by author Michael Reaves to be the final confrontation in the " " trilogy . Though the cover of " " depicts Vader and Pavan facing off with lightsabers , the two never actually engage in a lightsaber duel .