Armillus Dynat rose to the rank of Praetor within the XX Legion by mastering the one discipline the Alpha Legion prized above all others, the art of the perfectly executed stratagem, in which every enemy movement had been anticipated and every outcome shaped long before the first shot was fired. A commander of formidable intellect and cold patience, Dynat treated warfare as an intricate mechanism to be assembled piece by piece, and his operations unfolded with a precision that left his foes convinced they had been undone by their own mistakes rather than by any enemy hand.
Trusted with independent command of significant portions of the Legion's strength, Dynat exemplified the initiative and self-reliance that the hydra's cell-based doctrine demanded of its officers. He needed no constant direction from his primarchs, only a purpose and the freedom to achieve it by whatever labyrinthine means he judged best. In the campaigns of the Heresy, Praetors like Dynat translated the twins' grand designs into the fire and steel of individual battles, orchestrating ambushes and misdirections that turned entire warzones to the Legion's advantage. To his enemies he was a phantom author of disasters; to his Legion, a living proof that the XX's guile was matched by genuine martial genius.