Alliance ( Imperious - class ) The Alliance , originally known as the Imperious , was a large , powerful warship built by the Galactic Empire ruled by Darth Krayt . It was the prototype of the " Imperious " - class Star Destroyer , a Star Destroyer design larger and more powerful than the " Pellaeon " - class . It was a personal flagship of Galactic Alliance Admiral Gar Stazi . History . Construction . Darth Krayt , Dark Lord of the Sith and Emperor of the new galactic empire , had made a demand for a new class of warship that could overpower any type of ship used by the Empire ' s numerous enemies . With this demand , Moff Rulf Yage , the head of the Imperial Navy , proposed the idea of the " Imperious " - class Star Destroyer , an upgrade of the " Pellaeon " - class . The " Imperious " was constructed in the Mon Calamari Shipyards in 137 ABY , at the time under control of the usurper faction of the Empire . It was one of the largest ships in the Empire , as well as the pride of the Imperial Navy . For its maiden voyage , the " Imperious " was to be operated by skeleton crews . Theft . Meanwhile , the Galactic Alliance Remnant was one of the major opponents of Krayt ' s empire . Admiral Gar Stazi , the Alliance ' s leader , heard of the " Imperious " , and knew this was something they couldn ' t pass up . Stazi made plans to steal it , asking his old friend Gial Gahan to assist with it . But on the day Stazi and his fleet made the attempt , they were trapped . Admiral Dru Valan , an Imperial commander with a personal vendetta against Stazi , had known about Stazi ' s plans and set up a trap to capture or kill Stazi and destroy his fleet . What Valan didn ' t know was that Stazi was prepared for the trap , and turned the Imperials ' trap against them . Stazi ordered his fleet to attack the Outer Rim Third Fleet . When Valan ordered a return fire and fire from the shipyards , the shipyards joined the Alliance in firing on the Imperial fleet , having been hacked by Rogue member Monia Gahan . Meanwhile , the " Imperious " was retaken by the Alliance ; the stormtroopers that had seized it were actually Alliance commandos in disguise . Led by Hondo Karr , they piloted the ship away from the shipyards and successfully got it out of the system . After this , the Alliance fleet retreated behind the planet Dac and were able to escape and make it to the rendezvous point . The " Imperious " was now in the hands of the Galactic Alliance Remnant . They then began the process of bringing its weapon systems online . Alliance Flagship . Stazi appointed the ship as his new flagship , the successor to the " Indomitable " . The Alliance , however , was unaware that Roan Fel ' s Empire - in - exile had sabotaged the " Imperious " ; activation of the ship ' s weapons would cause the detonation of three series of bombs that would destroy the vessel . However , Monia Gahan and Imperial Knight Sigel Dare were able to warn Admiral Stazi . The bombs were deactivated and Stazi , impressed that Fel ' s forces were willing to help him , asked Dare to tell Fel that he was willing to once again negotiate an alliance against the Sith . He also renamed the ship the " Alliance " . Meanwhile , Darth Krayt was furious that Stazi had escaped with his best ship , and ordered the genocide of the Mon Calamari for two reasons : to punish the Mon Calamari and try to dissuade any further resistance to his empire . However , while this move did cow some systems into line , many more were outraged and allowed ships from their defense fleets to join Stazi ' s forces . This was presumably intensified with the death of Krayt on Had Abbadon . As the vessel was properly outfitted for battle , its sides were adorned with the symbol of the Galactic Alliance , in a similar fashion to the " Lusankya " , when it was used by the New Republic over a hundred years before . Under the command of Admiral Stazi , the " Alliance " fought against the Coruscant Third Fleet during the Battle of Ralltiir . However , Stazi and his crew didn ' t know there was a traitor onboard their ship . The traitor ' s betrayal led to an assassination attempt on Stazi and an attack by the First Coruscant Task Force . Fortunately , the assassination attempt failed and the Imperial fleet was outmanuevered and forced to retreat . The traitor , despite deeply regreting his actions , was imprisoned and later expected to be court martialed and executed . Imperial attack on Dac . The " Alliance " was present over Dac when the Sith poisoned the waters of the ocean planet in an effort to wipe out every living thing — but Admiral Gar Stazi wasn ' t ready to abandon the native Mon Calamari without an attempt at evacuation . The " Alliance " led an attack on the Sith forces stationed in orbit above Dac , which succeeded in driving the Sith into retreat . When the Outer Rim Third Fleet responded , the " Alliance " once again led the Remnant ' s attack . While at first the forces were relatively evenly matched , Imperial forces loyal to Roan Fel arrived and helped turn the tide in the Alliance ' s favor . The Sith retreated once again , and the evacuation continued . But the evacuation only succeeded in rescuing about twenty percent of the planet ' s 27 billion inhabitants before the poison made it too deadly to continue .