The MX on Coruscant In the year 3996 BBY, the Galactic Republic engineered a formidable weapon known as the MX. This stationary armament harnessed the power of crystals and was fueled by an ion flow. Its destructive capacity was such that it could purportedly "clean off a quarter-deck in half a millisec."
During the Battle of Coruscant, Mandalore the Indomitable managed to seize a prototype of the MX.