The Inexpugnable-class tactical command ship was a large warship class used by the Republic Navy during the Mandalorian Wars. Designed and manufactured by Rendili Hyperworks and Rendili/Vanjervalis Drive Yards, the Inexpugnable-class was used as a flagship and command ship. Often described as a mobile space station, at 3,100 meters in diameter it was one of the largest Republic spacecraft of its time. Warships of the class saw combat at a number of battles in the Mandalorian Wars, including the Battle of Serroco. The Inexpugnable-class was renowned for its ability to lead massive Republic fleets, employing advanced command techniques such as the Vanjervalis Chain to command up to sixty-four Hammerhead-class cruisers simultaneously. Despite its usefulness as a fleet flagship, the ship had several weaknesses, and as such, only six Inexpugnable-class ships were manufactured—one of which, the Courageous, was destroyed in early 3963 BBY, shortly following the Republic's involvement in the Mandalorian Wars. They were replaced as Republic command ships by the Centurion-class battlecruiser before the end of the Mandalorian Wars.
The Inexpugnable-class tactical command ship was disc-shaped, with an opening in its center. At 3,100 meters in diameter, it was often described as a mobile space station. The bridge was innovative in design; holograms were projected over a transparent deck on the bridge, providing a merger of electronic and visual data and facilitating command. This bridge design, referred to as the "wishing well" by Republic helmsmen, could sometimes produce vertigo. The Inexpugnable-class was operated by a crew of 4,300 Republic officers and enlisted personnel. It also carried a total of 2,000 troops. The class could carry up to 50,000 metric tons of cargo and enough consumables for optimal ship and crew operations for two years.
Vessels of the Inexpugnable-class were equipped with five double turbolaser batteries, five light turbolaser batteries, two point-defense laser cannon batteries, and two tractor beam batteries. Three turbolaser batteries were situated on each side of the main circular superstructure, along with two near the bridge of the vessel. The Inexpugnable-class was propelled by four large thrusters that were in turn powered by engines deep within the circular superstructure. For faster-than-light travel, it came equipped with a Class 2 hyperdrive and a Class 10 hyperdrive as backup.
The warship had large hangars and a command area located underneath the main superstructure, to the stern. Additional hangar decks were located on the vessel's bow to allow rapid deployment of fighters from multiple levels. In addition to the fighter decks, there was a cargo bay located adjacent to the ship's brig. The class could carry 144 Aurek-class tactical strikefighters and twenty-four S-250 Chela-class starfighters. The ship was also capable of housing small transports—twenty-four Conductor-class landing craft and six Ministry-class orbital shuttles. In addition, its hangar bays could carry a number of Republic support ships.
The Inexpugnable-class served as a command ship in the Republic Navy. Rendili Hyperworks and Rendili/Vanjervalis Drive Yards designed it in order to sell more Hammerhead-class cruisers to the Republic. Weapons coordination during the Mandalorian Wars became a major concern for Republic tacticians, as Republic lines were often defended by dozens of Hammerhead-class cruisers. The Inexpugnable-class was designed with an enhanced sensor package and an innovative bridge design, which allowed a flag officer to command a fleet of up to sixty-four Hammerhead-class cruisers at once. The Inexpugnable-class's many large hangar bays allowed it to rapidly deploy its fighter squadrons, but also made the ship vulnerable to ramming attacks and boarding operations. The role of command ship was later taken up by the smaller Centurion-class battlecruiser.