Imperious - class Star Destroyer The " Imperious " - class Star Destroyer , also known as Advanced Star Destroyer , was the designation given to the Imperial Star Destroyer " Imperious " , which was built during the Second Imperial Civil War for the Imperial Navy . Characteristics . The " Imperious " - class was designed to make use of several especially large thrusters and sported a ' tailfin ' similar to those of the Star Destroyers of the Galactic Republic . The class ' command bridge was very similar in design to those of most Kuat Drive Yards warships , while spaced in pairs on its sloped superstructure were several towers of unknown purpose . . Compared to the " Pellaeon " - class , the " Imperious " - class was larger and more powerful , as well as more efficient in the regulation of its power . It had better shielding to the point that it could take on the full firepower of the Outer Rim Third Fleet before the shields began to falter , armor , and weapons ( which included gravity mines ) allowing it to outgun any ship within the Imperial Fleet of Darth Krayt ' s Galactic Empire . In addition , the " Imperious " - class could be operated by a smaller crew . Generally , it was to the " Pellaeon " - class what the " Imperial II " - class Star Destroyer was to the preceding " Imperial I " - class . History . The " Imperious " - class started life as the answer to Darth Krayt ' s demand for a new class of warship that could overpower any other warship type used by the enemies of the Empire . Proposed by Moff Rulf Yage , head of the Imperial Navy , the project was turned over to the engineers and designers of the Mon Calamari Shipyards , who were tasked with creating a new warship that was an overall improvement of the successful " Pellaeon " - class Star Destroyer . As such , the " Imperious " - class was ironically a Mon Calamari design , despite being built for the Empire . Soon enough , a prototype was constructed at the Mon Calamari Shipyards , but in 137 ABY , before it could embark on its maiden voyage , it was used as bait for Galactic Alliance Admiral Gar Stazi and his remnant forces . Imperial Admiral Dru Valan of the Outer Rim Third Fleet attempted to trap Stazi and his fleet , but Stazi ' s fleet was able to escape with the " Imperious " . Masters Sigel Dare and Treis Sinde of the Empire - in - exile Imperial Knight s had planted explosives on the ship , meant to activate once the weapons - systems came online , long before the ship was hijacked by the Alliance . When Admiral Stazi became aware of the danger , the explosives were removed , and the two governments began discussing an alliance again . The ship was rechristened the " Alliance " by Stazi to symbolize the one thing the Sith feared the most . Despite the loss of the prototype , the damage to the shipyards that built it , as well as their subsequent shutdown following the Sith ' s extermination of the Mon Calamari , Krayt ordered the construction of more " Imperious " - class vessels before his demise . At least one other " Imperious " - class vessel was fielded . The " Darklight " was sent to subjugate Falleen in 138 ABY . The ship was lost when it was infiltrated and sabotaged by Cade Skywalker and Wolf Sazen .