Castellax-class Battle-Automata

The Castellax Class Battle-Automata is the most common pattern of the widespread Castellan-type battle automata in service to the mysterious Legio Cybernetica and serves as a general battle unit developed during the Great Crusade from its ancient forebear. Primarily intended for siege work and shock assaults, the Castellax Battle-automata is a hulking humanoid machine with a notoriously aggressive and responsive Machine Spirit, and an enviable reputation on the battlefield. The Castellax, employed in units of one to five by the Legio Cybernetica, has a standard configuration of Bolter and Bolt Cannon armament, and is able to maintain a punishing barrage of firepower as it advances.

History
The most common Castellan-type Battle-Automata in service, is the Castellax class. Developed from its ancient forebears, it was primarily intended for siege work and shock assaults, it is a terrifying humanoid machine thrice the height of a man, with a notoriously aggressive and responsive machine-spirit, and an enviable reputation on the battlefield. Its armoured endoskeletons is proof against small arms fire and highly resistant to damage thanks to its durable design and the presence of the same atomantic shielding technology that features on the Legiones Astartes Contemptor Pattern Dreadnought. The Castellax class was a mainstay both of the Legio Cybernetica and the elite defensive formations of many Forge Worlds, who relied on its formidable power for their protection. Some in the Imperial hierarchy saw the steady increase in the number of these war machines as a sleeping threat to the supremacy of the Imperium should the Mechanicum ever default on its treaty of mutual support with the Emperor. History was to take a different course, and in a few short years with the outbreak of the Horus Heresy thousands of these war engines would be broken on the wheel of war, and the Castellax was never to be seen again in such numbers.