Duel in the Jedi Temple ruins

"You return to me as a hero of the Empire, my son. Our victory is complete. I wouldn't count on that."

- An unknown Jedi Knight interrupts Tarnis' father, Darth Angral

During the Cold War between the Galactic Republic and the Sith Empire, an unknown Jedi Knight and the Padawan Kira Carsen fought a duel with the Sith Lord Tarnis in the ruins of the Jedi Temple. The Knight and Carsen had learned that the Republic scientist Tarnis was actually a Sith Lord, and that he had stolen the Planet Prison superweapon and was setting it up in the ruins of the Jedi Temple.

Prelude
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. When the Knight arrived on the planet with the astromech droid T7-O1, the pair met with the Knight's former master Orgus Din in the Senate Tower. The two Jedi also met with the Mon Calamari General Var Suthra, SIS Agent Galen, and Carsen, the Knight learned that the SIS and Carsen had traced Tarnis' location to a military vault in the [[Justicars' Sector. Carsen accompanied the Knight into the region, which was controlled by the militant vigilante group known as the Justicars' Brigade, and discovered the dead bodies of the engineering team where Tarnis had made his transmission from. The only person still alive, a technician named Jonkan, told the two Jedi what had happened. Tarnis had tricked the members of the project, telling them that the Jedi were going to shut it down and asking them to steal the prototype for him. However, when the engineering team arrived with the weapon, Tarnis killed them all. Before he died, Jonkan told the Knight that the Planet Prison needed time to charge up, and it generated an enormous amount of heat while doing so. Thanks to the technician's help, Carsen and the Knight were able to track Tarnis' location to the ruins of the old Jedi Temple.[13]

The duel
The duo raced to the Temple through The Works, the industrial sector of the planet, and were forced to fight their way through Imperial forces who were searching the ruins for a navicomputer. The Knight and Padawan found Tarnis deep in the Temple, in the middle of a holocomm conversation with four other Sith Lords: Darth Angral and his three apprentices Lord Sadic, Lord Praven, and Lord Nefarid. Tarnis revealed to the intruders that he was in fact the son of Darth Angral, and that the Planet Prison was minutes away from firing. Jedi and Sith dueled in front of the holocomm, and Angral was forced to watch as the Knight struck down his son before his very eyes. The Sith declared undying hatred for the Knight, warning the Jedi that he would destroy everyone and everything in his path until the Sith had his revenge.

Aftermath
Luckily, however, the Planet Prison had not yet completed its startup sequence, and the two Jedi were able to disable and destroy the weapon. But when they returned to the Senate Tower and spoke with General Var Suthra, the two learned that Tarnis had downloaded all of the files on the Republic's superweapon projects and sent them to his father before his death. Angral had declared war on the Jedi—the Knight in particular—in transmissions across all Republic channels, and Var Suthra feared that the Republic's weapon projects were in danger. The Empire had declared that Angral was no longer sanctioned, but the Mon Cal strongly doubted that the Empire disapproved of Angral's actions. Suthra asked the Jedi to go to Ord Mantell, where his agents had discovered one of Angral's bases, and gave the Knight a Defender-class light corvette as their own personal ship. The Knight also took Kira Carsen on as an official Padawan, assuming the role of Carsen's teacher while Master Kiwiiks departed with Master Din to investigate the Republic weapons projects.

Appearances

 * Star Wars: The Old Republic