The Macharius Heavy Tank is used by the Imperial Guard. As with many Imperial armoured vehicles, there are various variants of the Macharius. The Macharius Omega is one such variant, it is armed with the Omega Pattern Plasma Blastgun.
The Omega Pattern Plasma Blastgun is a derivative of the Ryza Pattern Blastgun, optimised for reduced weight and size. This is achieved through the implementation of a compact generator and a smaller force crucible, allowing for integration into lighter platforms such as the Macharius.
The Ryza Pattern Blastgun is commonly deployed on the Stormblade super-heavy tank.