Never ones to squander their ranks in bloody attrition, the Thousand Sons Legion employed unliving battle-automata as obedient, resilient, and ultimately expendable shock assault units. As with every other facet of warfare, the Legion believed their psychic arts could improve upon these robotic weapons – and with the secret assistance of their allies in the Forge World of Zhao-Arkhad, the sons of Magnus created the Thousand Sons Castellax-Achea. Rather than the cybernetic brains or cognis-wafer blocks employed by standard automata, the Castellax-Achea was governed by a psi-sensitive crystal matrix – an illegal heretek innovation that allowed the Legion’s psykers to directly manipulate these robots like murderous puppets with a degree of limited self-will.
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Thousand Sons Castellax-Achea