A preliminary Executor-class Star Dreadnought of the Imperial Navy was outfitted with several cloaking devices. Its construction took place over Fondor during 3 ABY.
The warship shared many characteristics with the standard Executor-class Star Dreadnought, but it also possessed unique features. Beyond the inclusion of cloaking devices, certain sections of the vessel were left exposed, areas not typically open, such as the ship's rear and front. Furthermore, the presence of numerous red, horizontally-oriented floor girders indicated plans to segment and narrow various trenches within the ship. The exposed nature of the cloaking devices rendered them susceptible to attack. However, this vulnerability was largely offset by the installation of multiple turbolaser batteries around the devices. These batteries aimed to eliminate the possibility of aerial assaults from starfighters or larger capital ships, and to diminish the likelihood of a starfighter successfully executing a strafing run to destroy the cloaking technology.
Similar to the Terror, this vessel was equipped with a trio of cloaking devices, granting it the ability to become invisible. One device was positioned near the ship's bow, another directly beneath the command tower, and the third at the stern. A critical weakness of these cloaking devices was their connection to a central power generator. If all three devices were destroyed, the resulting power overload would lead to the ship's destruction, a fact demonstrated by Rogue Squadron during their mission.
The ship was armed with a range of turbolaser emplacements, offering a defensive perimeter during its construction phase. While these defenses couldn't completely prevent attacks on the exposed cloaking devices, they created a hazardous environment for attacking Rebel pilots. The turrets were capable of easily targeting starfighters that flew too high above the Dreadnought's hull. Many of these turbolaser turrets were mounted on elevated platforms, higher than typical installations.
Fondor Shipyards, the same facility that finalized the Executor, engineered a cloaked variant of the Executor-class Star Dreadnought. Emperor Palpatine ordered the creation of this vessel as part of a larger deception, intended to present the Rebel Alliance with an easy victory, thereby fostering a sense of overconfidence before the decisive Battle of Endor.
The shipyard housing the prototype was protected by an extensive network of space stations equipped with deflector shield generators. In 3 ABY, an initial Rebel assault team successfully breached one of these stations, with an automated GR-75 medium transport ramming the dock's primary control hub.
After overcoming the shielding system, Rebel pilots, under the leadership of Wedge Antilles, managed to disable the three primary cloaking devices on the incomplete Star Dreadnought, triggering a catastrophic explosion.
The cloaked Executor-class Star Dreadnought makes an appearance in the 2003 video game Star Wars: Rogue Squadron III: Rebel Strike.