Trained on Mars by the Mechanicum 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 Veterans whose injuries required extensive Bionics. Known to be solitary individuals, they rarely advanced up the chain of command. Some Legion's 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.
- 1: The Horus Heresy Book Six, pg. 232
- 2: Warhammer Community: God Machines and Angels (Page no longer online, no archived version found)
- 3: Forge World: Legion Praevian (Page no longer online, no archived version found)