Sullust / Legends Sullust was the primary planet of the Sullust system , located in the Outer Rim Territories at the conjuncture of the Rimma Trade Route and the Silvestri Trace . It was the homeworld of the Sullustans . Description . Sullust was a terrestrial planet that occupied the fourth orbit from the star Sullust in the Sullust system in the Brema sector of the Outer Rim Territories region of the galaxy . Situated on the Rimma Trade Route and within the area known as the Trailing Sectors , Sullust had standard gravity and possessed two moons : a large planetoid named Sulon and an unremarkable hunk of rock named Umnub . Sullust ' s day lasted 20 standard hours and its year lasted 263 standard days . The planet was 12 , 780 kilometers in diameter and featured terrain including mountains , volcanoes , rocky deserts , and caves ; multicolored rock veined by channels of magma covered Sullust ' s entire surface . The atmosphere of Sullust was barely breathable , with hot and thick clouds of toxic gases released in volcanic eruptions rendering the planet ' s surface lethal for sustained habitation and uncomfortable for short visits . Atmospheric blackouts occurred on a regular basis due to large gouts of smoky ash . Its surface was also dangerously volatile ; while Sullust ' s geology was poorly understood , the mantle between the planet ' s core and its thick crust appeared to be semipermeable , allowing eruptions to occur frequently . Most of the opaque substances ejected by the volcanoes remained in the upper atmosphere while heavier gases flowed back down , resulting in high surface visibility and noxious surface air . Sullust was popularly known as " the volcano planet , " but only certain portions of the world contained active volcanoes . Few of the volcanoes were reliably extinct , however . The Sullustan species evolved in the more hospitable underground of the planet , where a stable system of tunnels connected edible lichen gardens to pools of potable water . A hub of trade along the Rimma Trade Route , Sullust had a corporate system of government and exported starships , computers , droids , hyperdrive technology , and astrogation technology while importing foodstuffs and water . During the reign of the Galactic Empire there were many bases built on the planet , and several major cities were locked down by Imperials . History . The planet joined the Galactic Republic when Sullustan merchants connected their planet to Tapani sector with the Rimma Trade Route in 5500 BBY . Sullust became a major hub of trade soon after it achieved contact with the rest of the galaxy , and the presence of corporations and manufacturing on the world increased as galactic commerce became more common there . The SoroSuub Corporation was already a part of Sullust ' s economy and government when the planet first gained access to interstellar travel , and over time , SoroSuub aided Sullust ' s government while becoming increasingly influential in the diplomacy of Sullust . Sullust was an honored member of the Galactic Senate . It was attacked by the Krath during the Great Sith War , but was successfully defended by the Galactic Republic . The world was volatile with hundreds of active volcanoes , producing a noxious , toxic atmosphere and intense electrical storms . These conditions , combined with the planet ' s rich mineral deposits , caused the native Sullustan inhabitants to live in underground caves . The underground caves were humid and cool , with a diverse biosphere supported by underground lakes . The planet was once known for its podraces . During the New Sith Wars , the Brotherhood of Darkness captured the planet . Sullust was the headquarters of the galaxy - spanning SoroSuub Corporation , a member of the Commerce Guild . Nearly one - half of the population was under its employment . As the Old Republic crumbled , the governing Sullustan Council became weak . Under President Beolars Bribbs who was also the Galactic Senator , the planet seceded from the Republic in 22 BBY and joined the Confederacy of Independent Systems . Less than a month later the Republic dispatched a task force to retake the planet , led by Jedi Knight Rees Alrix . The Republic took heavy casualties in the battle due to a treachery in their midst and the planet remained one of the Confederacy ' s most prized holdings until the end of the Clone Wars . With the expansion of Palpatine ' s New Order , SoroSuub assumed leadership of Sullust with Corporate Proclamation 137d and announced its full support of the Empire . In exchange for several lucrative contracts and the promise of guaranteed future business , SoroSuub took a hardline against the Rebel Alliance and its supporters . Angered at SoroSuub ' s illegal takeover and support of the Empire , Sullustans formed resistance cells under the leadership of Sian Tevv that became model rebel cells during the Galactic Civil War . Tevv ' s resistance fighters , combined with a coup to take over SoroSuub by pro - Alliance forces , garnered enough support to wrestle control of Sullust away from SoroSuub shortly before 0 ABY . Several months after the Battle of Yavin , Rogue Squadron launched a strike to destroy a Capacitor . The Sullustan resistance remained independent from the Alliance , although it allowed the Alliance Fleet to use Sullust as the staging point for planned destruction of the Death Star II , since Sullust was an endpoint of the Sanctuary Pipeline as well as due to a board chairman of SoroSuub being rescued from Imperial detention by Rebel force . The Alliance also launched a diversionary attack in the system , to draw the Imperial fleet away from Endor . After the Battle of Endor , Sullust was one of the first worlds to officially align itself with the Alliance of Free Planets , and subsequently the New Republic . It was represented on the New Republic Provisional Council by Sian Tevv and later in the New Republic Senate by Sien Siev and Niuk Niuv . Sullust went on to be a key member of the Galactic Alliance . In 5 ABY , Superior General Sander Delvardus of the neighboring Eriadu Authority tried to conquer Sullust but he was defeated by Sien Sovv who launched a counterattack campaign that liberated all the Authority . Darth Krayt ' s Galactic Empire took control over Sullust after the end of the Sith – Imperial War . SoroSuub was forced to keep at least 80 % of its production facilities manufacturing Imperial vessels , most of which were not even of Sorosuub design . Forced into desperation , Sullustans began building secret underground facilities closer to the planet ' s core . Products created in those facilities were secretly smuggled offworld and sold in open market . Behind the scenes . Sullust was one of the first planet - names seen in the early drafts of " " . It first appeared ( slightly differently spelled ) in the name of the Bomerwrights of Sullest , crafters of laser swords , in the . In the and all the versions up to the shooting script , Luke Skywalker still referenced Sullust , along with the planet Aquilae , but this line was eventually cut out of the final movie . Some pre - Prequel - era Expanded Universe sources mistakenly refer to Sullust as the place where Darth Vader was defeated by Obi - Wan Kenobi and suffered his injuries . One level of video game " " , referring to the raid on Sullust , shows a base similar to the one of Darth Vader ' s defeat , plus an environment similar to Mustafar , adding to the confusion . The PC game " " and " " mistakenly place Sullust in the Sluis sector of the Core Worlds . The Sluis sector is actually located in the Outer Rim . Moreover , " Star Wars : Rebellion : Prima ' s Official Strategy Guide " misspells the planet as " Sulust . " Additionally , " Rebellion " in - game encyclopedia entry for Sullust mistakenly states that the Sullust system openly threw their support to the Rebel Alliance after the Battle of Yavin . Rather , the Sullustan resistance movement merely provided independent support and aid , while many others remained hesitant to become involved , or still remained pro - Imperial . In " " the planet is seen much differently . It is shown as a green soiled planet with some geysers and some volcanic activity . It is unknown if this is just the inside or the outside as IG - 88 jumps from a speeding troop transport .