Inexorable ( Imperial I - class ) The Inexorable was an " Imperial I " - class Star Destroyer that served in the Imperial Navy during the Galactic Civil War between the Galactic Empire and the Alliance to Restore the Republic . This ship was present and helpless when the Rebellion captured the shuttle " Tydirium " shortly before the Battle of Endor but it was best known for its role during Grand Admiral Thrawn ' s campaign against the New Republic in 9 ABY . As one of the main ships of Thrawn ' s fleet , the " Inexorable " fought at the battles of Bpfassh and Sluis Van . Description . The " Inexorable " was a standard " Imperial I " - class Star Destroyer . It was a 1 , 600 meters long warship armed with turbolasers , ion cannons and tractor beam projectors . The ship also carried a complement of TIE starfighters , terrestrial troops and various ground vehicles . Due to the limitations placed upon the Empire after the Battle of Endor , the TIE complement had been reduced from six to three squadrons by 9 ABY . History . The " Inexorable " was constructed by the Galactic Empire at the Kuat Drive Yards shipyards on Kuat during the Galactic Civil War between the tyrannical Empire and the Alliance to Restore the Republic . It was nearing completion in 3 ABY . Shannon Voorson , the dauhter of Kuat Freight Port officials Johan and Nell Voorson , was able to slice its name in an Imperial database along with several other Star Destroyers names and gave it to her cousin , Deen Voorson , a member of the Rebellion . In 4 ABY , the " Inexorable " was seen undergoing weapons testing along with the " Imperial " - class Star Destroyers " Chimaera " , " Nemesis " and " Stormhawk " in the Carida system . Rebel pilot Ace Azzameen ' s " Otana " mistakenly emerged from hyperspace near the Star Destroyers but managed to escape . The " Inexorable " followed the " Otana " to the Zhar system but arrived too late to prevent Azzameen and Rebel fighters to steal the " Tydirium " . This shuttle was later used by the Rebels to allow their great victory at the Battle of Endor . After the Battle of Endor , the " Inexorable " was part of the small Imperial fleet that was commanded by Thrawn , a misknown Imperial Grand Admiral on a mission in the Unknown Regions . In the later years , the Rebellion , now known as the New Republic , had become the legitimate galactic government . In 9 ABY , the " Inexorable " served in Grand Admiral Thrawn ' s campaign against the New Republic after his return to the known galaxy . The " Inexorable " was part of the task force of five Star Destroyers led by the Grand Admiral himself and coordinated by the Dark Jedi Joruus C ' baoth . During that campaign , " Inexorable " participated in the Battle of Bpfassh where it destroyed the New Republic starfighter base on the third moon of Bpfassh . Thrawn also used the ship to test a prototype cloaking device , after getting schematics from the secet Imperial storehouse on the planet Wayland . The " Inexorable " later fought at the Battle of Sluis Van , a failed attempt to steal a large fleet of starships at Sluis Van , a major New Republic shipyard . Commanders and crew . Director of Imperial Intelligence Ysanne Isard decided to transfer Major Wortin from the Interdictor " Black Asp " to the " Inexorable " as a punishment for his " incompetence " in capturing Rogue Squadron pilot Bror Jace in 6 ABY . The New Republic Intelligence ignored the identity of the " Inexorable " captain at the time of Thrawn ' s campaign . Behind the scenes . The " Inexorable " was created by Timothy Zahn in 1991 book " Heir to the Empire " . The " Heir to the Empire Sourcebook " describes it as one of the ship of Thrawn ' s core fleet but it is not mentioned in the two next books of the Thrawn Trilogy . " " classifies the " Inexorable " as an " Imperial II " - class Star Destroyer .