The 'GC-C21' Brawler is a combat Mech favoured by corpo mercs due to its relatively low scrip debt cost. The Terrestrial Democratic Alliance began to mass produce Brawlers during the Second Corpo War, and deployed them in the siege of the Central Wastes where they obliterated the Herrsch home arco. They later became one of the first combat Mechs to be produced as an open source blueprint by the Opus Institute.