Introduced during the Mark IIIA phase of Indomitus Pattern Terminator Armour development, this weapon is the standard alternative to the Heavy Flamer as a Terminator Squad's special ranged weapon.
The Assault Cannon was developed after the end of the Horus Heresy in the early 31st Millennium as a replacement for the Autocannon. It is a medium calibre rotary Autocannon, with its 6 barrels cycled by an electric motor past a single chamber. The Assault Cannon is a ballistic six-barreled, self-loading rotary Autocannon, effective against infantry targets and light vehicles at close to medium range.