The MX on Coruscant The MX represented a formidable, heavy armament under development by the Galactic Republic around the year 3996 BBY. Functioning as a stationary defense system, it harnessed the energy of crystals and was fueled by an ion stream. Accounts indicated its destructive capability was such that it could "obliterate a quarter-deck in a mere half-millisecond."
During the Battle of Coruscant, Mandalore the Indomitable managed to seize a preliminary version of the MX.