In battle, the Castellax is animated by an aggressive machine spirit, its armoured endoskeleton making it near impervious during its assault. It is at its most deadly, however, when paired with the arcane and lethal darkfire cannon. Unleashing screaming beams of pure darkness, armour, flesh and stone boil away with their touch, and even the most heavily armoured vehicles can be torn apart by their hellish un-light.

The Mechanicum Castellax Battle-automata with Darkfire Cannon is a complete multi-part resin kit and includes a choice of bolters or flamers as secondary weapons.