X1 ' s Executor - class Star Dreadnought This " Executor " - class Star Dreadnought was a warship in the service of the Galactic Empire . Following the death of Emperor Palpatine at the Battle of Endor , this Star Dreadnought became the flagship of X1 , a Force - sensitive clone and aspiring emperor . Following the New Republic ' s liberation of Cloud City on Bespin , X1 used the Super Star Destroyer to travel to Bast Castle , the former retreat of the Dark Lord of the Sith Darth Vader , on the acid rain - drenched planet Vjun to learn the secrets of the dark side of the Force . The Star Dreadnought was later present above volcanic Mustafar , the de facto capital of X1 ' s faction , during a New Republic attack on the planet . While New Republic troops on the ground were busy dealing with X1 ' s forces , the Imperials raised a planetary shield — used in conjunction with a separate shield protecting X1 ' s base — to prevent any New Republic reinforcements from arriving . X1 ' s clone brother , X2 , infiltrated the Star Dreadnought following a decoy assault and used the Super Star Destroyer ' s weapons to destroy the Imperials ' shield projectors . Although the base ' s shields went down , the planetary shield remained operational , prompting X2 to ram the warship into the defensive barrier . The move deactivated the shield and allowed the New Republic ' s reinforcements to land . The Super Star Destroyer was destroyed in the collision , and its burning remains settled on Mustafar ' s surface . Description . This warship was an " Executor " - class Star Dreadnought , one of many Super Star Destroyers serving the various fragments of the Galactic Empire in the wake of the Battle of Endor . It was used as a command ship by the Force - sensitive clone X1 , an Imperial warlord . The ship featured an autoturret defensive grid , as well as a blasterfire - activated alarm system capable of sealing off areas with force fields and locking down turbolifts near the source of the blasterfire . History . Following the death of Emperor Palpatine at the Battle of Endor in 4 ABY , the leaderless Empire began to fragment as various warlords tried to fill the power vacuum . One such breakaway warlord was the Force - sensitive clone known only as X1 , who quickly consolidated forces loyal to his command . Among the capital ships that came to form X1 ' s fleet was this Star Dreadnought . Following the New Republic ' s liberation of Cloud City on the gas giant Bespin , X1 sought to learn the secrets of the dark side of the Force . To accomplish the task , he ventured to Bast Castle , the retreat of Palpatine ' s apprentice Darth Vader , on Vjun . X1 used the Star Dreadnought to travel to the acid rain - soaked world . Some time later , the warship was present above the volcanic world of Mustafar , the de facto capital of X1 ' s empire . The New Republic launched an attack on Mustafar , hoping to defeat X1 and his forces . A wave of New Republic troops arrived on planet but was unable to advance on X1 ' s base , which was being protected by a shield . Additionally , the Imperials raised a planetary shield that prevented the New Republic from landing reinforcements to assist the beleaguered troops . X1 ' s clone brother , X2 — a longtime enemy of the Empire — devised a plan to deal with both enemy shields . Staging a decoy attack on the Imperial fleet , X2 infiltrated the Super Star Destroyer in his X - wing starfighter and fought his way to the warship ' s bridge . On the bridge , X2 used the Star Dreadnought ' s weapons to destroy the shield projectors generating the Imperials ' shield defenses . The clone succeeded in this task , but only the shield protecting X1 ' s command center went down . With the planetary shield still active , X2 opted to ram the Super Star Destroyer into the barrier . The impact brought down the shield and destroyed the Imperial warship , whose remains settled onto the lava plains on Mustafar ' s surface . With the Imperials ' defenses down , the New Republic was able to land its reserves and defeat X1 ' s forces . X2 , meanwhile , escaped the destruction of the Star Dreadnought and went on to defeat his clone brother after a brief lightsaber duel , ending the threat of X1 ' s empire . Commanders and crew . This Super Star Destroyer was commanded by X1 , a Force - sensitive clone trooper who had fought for the Galactic Republic during the Clone Wars and served under the Empire in the years of the Galactic Civil War . Following Emperor Palpatine ' s death at Endor , X1 was one of many Imperial leaders who declared themselves warlords and sought to become the new Emperor . He used this warship as his command ship . Additionally , many stormtroopers served aboard the Star Dreadnought . Behind the scenes . This unidentified " Executor " - class Star Dreadnought appeared in the 2009 video game " " . For the PSP version of the game , in which the ship only appears in two cutscenes , reused shots of Darth Vader ' s " Executor " from were used to depict X1 ' s Star Dreadnought . The warship plays a more prominent role in the Nintendo DS version of the game , which established its destruction during the Battle of Mustafar .