Terror The Terror was an " Executor " - class Star Dreadnought in service to the Galactic Empire during the Galactic Civil War . Under the command of Admiral Sarn , the " Terror " was assigned to protect the development of a new cloaking device for use with the TIE Phantom starfighter and was itself fitted with one of the devices , allowing it to become invisible to both sensors and the naked eye . During a visit from the Dark Lord of the Sith Darth Vader to oversee the deployment of the new starfighter in 3 ABY , the " Terror " was infiltrated by two Rebel saboteurs . The infiltrators , Rookie One and Ru Murleen , managed to steal a TIE Phantom and used it to destroy the " Terror " main reactor while it was docked to the TIE Phantom factory over Imdaar Alpha . Lord Vader escaped the " Terror " moments before the reactor exploded , destroying the Star Dreadnought , but he executed Sarn for his incompetence before leaving . Description . At nineteen kilometers long , the " Executor " - class Star Dreadnought " Terror " was one of the largest battleships in service to the Galactic Empire . Like all those of its class , the " Terror " gray hull was roughly shaped like an arrowhead when viewed from above . The top of the ship had a smooth hull surrounding an island of habitable sections in the center and a trapezoidal command tower towards the rear . The underside was covered by a network of superstructure and the thirteen red - glowing engines which propelled it through space . When the " Terror " was assigned to the TIE Phantom project , it was fitted with a cloaking device powered by stygium crystals . The cloaking device allowed the " Terror " to become invisible to both the naked eye and sensor systems on other starships . Approaching Imperial vessels were required to transmit the correct security code before the ship would decloak to allow them to dock . As the cloaking device was deactivated , the " Terror " would become visible from bow to stern , with the whole process completing in under ten seconds . The " Terror " was equipped to act as a carrier for the Empire ' s fleet of TIE Phantoms . A series of adjoining service hangars , separated by blast doors , contained hundreds of the cloaking device - equipped starfighters mounted on racks along the walls . Mechanical arms were used to remove each TIE Phantom from its rack ready to launch or undergo maintenance . The fighters could be moved around the ship suspended from ceiling - mounted rails which ran through cavernous rooms crisscrossed by walkways and retractable bridges . Additional hangars were located on both sides of the ship to allow access for shuttles and other vessels . In addition to the TIE Phantoms stationed aboard the " Terror " , at least one of these hangars had facilities to store a number of TIE interceptors mounted from its ceiling . The " Terror " bridge , situated in the command tower , featured two crew pits separated by a walkway leading to the large forward viewports . The ship was fitted with a meditation chamber for use by the Dark Lord of the Sith Darth Vader . This pressurized spherical chamber contained equipment to allow the Sith Lord to quickly remove and replace his helmet . The Star Dreadnought had its own sewer system , comprising a network of interconnected tunnels in which waste material ran beneath walkways . The sewers could be entered via access panels in the floor of the above deck . The ship ' s main reactor was located in a circular chamber surrounded by beam focuser s which prevented it from going critical . The reactor could be accessed through a series of large tunnels throughout the superstructure . The tunnels , which were filled with moving machinery and periodically divided by force fields powered by shield generators , were large enough for a starfighter to fly through . At least one such tunnel from the reactor core led outside the ship . History . The " Terror " was one of several Super Star Destroyers constructed by the Galactic Empire during the Galactic Civil War and entered service under the command of Admiral Sarn by 3 ABY . For some years , Grand Admiral Martio Batch had been working to develop a practical cloaking device at his research facility on the moon Imdaar Alpha . Cloaking devices had once been common , powered by stygium crystals mined from Aeten II in the Dreighton Nebula . After the mines ran dry , the technology fell out of use until Batch used the Empire ' s " Tarkin " superweapon to destroy Aeten II , releasing thousands of stygium crystals into space . Batch set about using the crystals to produce a fleet of cloaked starfighters — modified V38 assault fighter s known as TIE Phantoms . The Grand Admiral requisitioned the " Terror " to serve as command ship of a fleet comprising at least two " Imperial " - class Star Destroyers protecting the project . The Star Dreadnought was itself fitted with a cloaking device and equipped to serve as a carrier for the TIE Phantoms . Following the Imperial victory over the Alliance to Restore the Republic at the Battle of Hoth in 3 ABY , the Dark Lord of the Sith Darth Vader visited the " Terror " to oversee the final field tests of the new starfighters . Vader observed from aboard the Star Dreadnought as TIE Phantoms from Sigma Squadron intercepted and destroyed a flight group of Rebel X - wings patrolling the region of space known as the Dreighton Triangle . When the field tests were complete , the Dark Lord ordered Sarn to take the " Terror " back to Imdaar Alpha to begin the final preparations to launch the TIE Phantom fleet against the Rebellion . The Rebel Alliance learned of the Empire ' s plans and dispatched pilots Ru Murleen and Rookie One to Imdaar to infiltrate the " Terror " and steal a TIE Phantom for study . As the " Terror " arrived at Imdaar and prepared to dock with Batch ' s cloaked facility , the Rebels approached in a supply shuttle stolen from the supply base on the planet and were permitted to dock . The intruders were soon discovered but used the " Terror " sewer to evade capture and reach a service hangar where they boarded a TIE Phantom . The Imperials quickly closed the outer bay doors to prevent their escape , but the Rebel pilots flew the stolen fighter through the Star Dreadnought ' s superstructure to its main reactor , destroying the beam focusers surrounding it before making their escape . As the " Terror " reactor began to overload , Vader executed Sarn for his failure before fleeing the doomed Star Dreadnought . The reactor blew soon after , destroying the " Terror " . The explosion caused the TIE Phantom factory to become visible , allowing the Rebels to fly inside and destroy it , bringing the TIE Phantom project to an end . Commanders and crew . During its involvement with the TIE Phantom project , the " Terror " was commanded by Admiral Sarn under the overall command of Grand Admiral Martio Batch , one of the most senior officers in the Imperial Navy . As the field testing of the new starfighters neared completion , the Dark Lord of the Sith Darth Vader assumed overall command of the project , operating from aboard the " Terror " . The Star Dreadnought ' s crew included numerous stormtroopers and pilots , along with various models of droid , including MSE - 6 - series repair droid s , R2 - series astromech droid s and remote s . Behind the scenes . The " Terror " was created by Vincent Lee for the 1995 LucasArts video game " " . It later received an entry in 2008 ' s " The Complete Star Wars Encyclopedia " and is mentioned in the 2003 " Star Wars Insider " 66 article " " , 2009 ' s " Rebellion Era Campaign Guide " , and 2012 ' s " The Essential Guide to Warfare " . The " Terror " is only described as a " command ship " in the game and is identified only as a Super Star Destroyer in later sources . However , " The Essential Guide to Warfare " identifies this as a term covering several classes of vessel and is one of several sources to identify ships of the " Terror " design as " Executor " - class Star Dreadnoughts .