Executrix Executrix was an " Imperial I " - class Star Destroyer belonging to the starfleet of the Galactic Empire . It served as Wilhuff Tarkin ' s personal vessel — during his service as Moff and later Grand Moff — from at least 18 BBY , up until Tarkin took command of the Death Star in 0 BBY , where the Governor was killed . Characteristics . Besides its several tactical rooms equipped with immense battle analysis holotable s , it was the only capital ship in the Imperial fleet with a containment field room . History . By 18 BBY , the " Executrix " was already in the service of Moff Wilhuff Tarkin , and was used at the Campaign at Salient . This battle took many standard week s , but ultimately led to the defeat of Captain s Has Obitt and Saw Gerrera , who led the rebelling factions on Salients I and II . After the capture of captain Obitt , Tarkin used ship ' s medical station to nurse the smuggler back to health , so that he could spy on Orson Krennic . In 14 BBY , the " Executrix " was deployed to the Obroa - skai system after a jump from Lantillies . Accompanied by a task force consisting of three Interdictor vessel s , a Detainer CC - 2200 , a CC - 7700 frigate , and an untested Immobilizer 418 cruiser , and other ships — including several frigate s , pickets , and gunboats — , the " Executrix " waited for the arrival of the " Carrion Spike " , a corvette belonging to Moff Wilhuff Tarkin but had been hijacked by a rebel cell . During the operation , the fugitive corvette was absent , which prompted Tarkin to not only interrogate the crew of the " Reticent " with Darth Vader , but also enter one of the " Executrix " ’ s tactical rooms , where he accessed a multitude of top - secret Republic and Imperial databases situated on Coruscant as the " Executrix " held its position on the Obroa - skai system . Through the databases , he discovered the identity of several of the insurgents , including Berch Teller , and their relationship to the Antar Atrocity . With Tarkin still on board , the " Executrix " arrived at a star system close to the Gulf of Tatooine where Teller ' s insurgents attacked once again , that time to destroy a convoy carrying components for the hyperdrive of one of the Empire ' s top secret projects , the Death Star . On Tarkin ' s orders , the " Executrix " lumbered between the warship ' s starfighter s and the Nebulon - B frigate , and the Imperial cargo ships going to Sentinel Base , turning the tide of the battle as it protected the convoy and deployed its V - Wing starfighters to attack the insurgents ' ships . As the " Executrix ' s " turbolaser s disabled the warship , the " Compliant " and the " Enforcer " , arrived from Pii only to see the battle had ended . Following the rebel ' s capture ( except Teller ) , Tarkin left the " Executrix " for Coruscant , where he spent three weeks . The Emperor himself , Palpatine , awarded the " Executrix " to Tarkin to compensate him for the loss of the " Carrion Spike " . In addition to the thousands of troop s and technician s who staffed and crewed the massive ship , he had a personal bodyguard of thirty - two stormtrooper s who accompanied him wherever he went . Aboard the " Executrix " , Tarkin traveled from the Core to the Greater Seswenna sector , and Eriadu , in his tour of the major systems of the Outer Rim after being promoted to Grand Moff of the aforementioned oversector . In 0 BBY , the ship was still in the service of Grand Moff Tarkin , and was used by the Governor to monitor construction of the Death Star , which included the massive superlaser being installed .