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Trained on [[Mars]] by the [[Mechanicum]]{{Fn|2}} these commanders were the keeper of the [[Legion]]'s robots, including [[Battle-Automata]] given honorary induction into the Legion's ranks. On the field of battle they marched at the forefront of Battle-Automata forces, guiding them through the engagement. They were often chosen from [[Space Marine Veteran|Veteran]]s whose injuries required extensive [[Bionic]]s. Known to be solitary individuals, they rarely advanced up the chain of command. Some Legion's Legions used the rank as a dumping ground for warriors seen as unfit for other duty. However in the [[Iron Hands]] and [[Salamanders]], the rank was seen as a great honor.{{Fn|1}}

*{{Endn|1}}: [[The Horus Heresy Book Six- Retribution]], pg. 232