Vjun / Legends Vjun ( or Vijjun ) was a dark , almost lifeless planet in the Vjun system , known for its acidic rainfalls and resultant lack of plant life . It was also renowned for its expensive hand - woven tunics . It was the location of Bast Castle , a fortress used by Count Dooku , and later a place where Darth Vader studied the dark side of the Force . History . After the fall of the Sith Empire , Vjun was one of the refuges for the Sith . Around 4000 BBY , Viscountess Mireya of Vjun married into the Tapani nobility by wedding High Lord Tritum XI of House Mecetti . Mireya brought with her Sith teachings that corrupted the House ' s protector organization , the Mecrosa Order , turning it into a Sith cult . Vjun was the homeworld of the Malreaux family , one of the oldest and wealthiest on the planet . The Viscount Malreaux performed experiments on midi - chlorians that drove the populace of Vjun insane , leading to their murder of each other in 29 BBY . One of the few survivors was the Viscountess Whirry Malreaux , who gave her son , Whie Malreaux , to the Jedi Order so he could escape the horrors of his birthworld . Whirry remained on Vjun with her Force familiar , the Vjun fox Miss Vix . Droids such as the FIII Footman droid and the R2 - series astromech droid were used as the workhorses of the Vjun population as they were rather more resilient to the highly acidic climate . During the Clone Wars , Vjun was located within Separatist space . In 20 BBY , Château Malreaux served as a hideout for Count Dooku in the Clone Wars . After taking over the château , he invited Jedi Master Yoda to come and save him from the dark side . In reality , Dooku had hoped to use the power of the dark side to destroy his former master . When Yoda arrived , he told Dooku to try and convert him to the dark side . Although Dooku told him of the wonders of the dark side , Yoda could not be turned and so Yoda tried to convert Dooku back to the light . This failed when Jedi Master Obi - Wan Kenobi and Anakin Skywalker appeared and Dooku suspected treachery . The planet later served as the headquarters of dark - side Executor Sedriss QL and Emperor Palpatine ' s elite forces of Dark Jedi . Before this , it was where Darth Vader ' s personal fortress , Bast Castle , resided . It had concentrated acid rain and the fortress was well guarded by many of Vader ' s best troops , including the legendary Dark trooper s . During the later phases of the Galactic Civil War , the clone trooper - turned Jedi X2 led New Republic forces to Bast Castle in the Battle of Vjun in order to find his brother , X1 , now a Sith Lord . Kam Solusar trained as a Dark Side Elite on Vjun before Luke Skywalker turned him to the light - side on Nespis VIII , six years after the Battle of Endor . Soon after , three Ysanna prisoners from Ossus were taken to Vjun to serve as raw material for creating new clone bodies of Emperor Palpatine . The Ysanna were frozen in carbonite to await the future construction of a clone laboratory within Bast Castle . However , Luke Skywalker and his Jedi trainees stormed the castle to defeat the Emperor ' s minions . Kyle Katarn and Jaden Korr visited Bast Castle in order to stop the cult known as the Disciples of Ragnos from draining the Force energy there . They soon found that Kyle Katarn ' s missing pupil , Rosh Penin , had been turned to the dark side and was stealing the energy himself . After a battle with Jaden Korr , Desann ' s former apprentice , Tavion Axmis , eventually came forth as the leader of the Disciples of Ragnos . However , she escaped with Rosh . Later , in 22 ABY , the Jedi historian Tionne Solusar discovered that Obi - Wan Kenobi ' s lightsaber had been recovered by Vader and stored at Bast Castle . Since an information broker had sold this information to them , she feared that others may have gotten to it first . Thinking it was just a simple trip and time for training , Tionne allowed Anakin Solo , Tahiri Veila , Uldir Lochett , and Ikrit to accompany her . They left on her " Jemlaat " - class yacht " Lore Seeker " . Having arrived at Bast Castle , they discovered another vessel and feared another group had reached it first . Tionne also discovered hssiss on Vjun , just like those on Ambria , suggesting the creatures had been bred on both worlds by the ancient Sith . Having survived the fortress ' s automated defense systems and booby traps , they discovered the lightsaber in a protected alcove . Unfortunately , a group of mercenaries and pirates under a cloaked man named Orloc arrived . Orloc wielded a lightsaber and claimed to be a mage who possessed great powers . His henchmen also stole Kenobi ' s lightsaber . In response , the Jedi pursued Orloc and his henchmen on a chase through Bast Castle . During a confrontation , Orloc easily defeated Ikrit in lightsaber combat since the Kushiban had no lightsaber at all . He also deceived Uldir by claiming to train him in all the Force skills he desired . However , the other Jedi managed to rescue Uldir and escape Bast Castle , along with Kenobi ' s lightsaber and the holocron of the ancient Jedi Master Asli Krimsan . The planet would come under the control of the Yuuzhan Vong during their invasion of the galaxy . Behind the scenes . Vjun is mistakenly referred to as Djun in " Dark Empire II " . Early press releases for " " also used the name Djun . Vjun is pronounced as " VAH - JUHN " in , but in , it is pronounced as " VUHN " . The PC game " " mistakenly places Vjun in the Moddell sector .