The Militarum Tempestus, also known as the Ordo Tempestus, is amongst the most rigidly codified of all Imperial organisations, for its troops form the elite backbone of the Astra Militarum, serving as its special operations units. Though the Ordo is technically a sub-faction governed by the Adeptus Administratum, it enjoys a far greater amount of autonomy than the Imperial Guard regiments that often fight alongside it.