He immediately ordered the creation of a number of similar units in his own Legion so that he might study and improve upon Perturabo’s innovation, proving himself once again the master of all of the myriad disciplines of war. The warriors of the Fulmentarus are equipped with Cataphractii Pattern Terminator Armour, enhanced to carry an array of targeting systems, referred to collectively as Peritarch Targeters, that make it possible for each to combine their fire in a highly coordinated fashion.

A larger number of such Targeters trained on an enemy unit from different angles increases the efficiency of the sum firing solution, allowing the squad’s weapons fire to more accurately find their foes, even through dense cover. When combined with a heavy weapons system such as a Reaper Autocannon, or the Cyclone Missile Launcher first utilised by the Tyrant Siege Terminators, these sensors make the Fulmentarus a fearsome heavy assault unit and one that, were it not for the outbreak of the Horus Heresy, might one day have entered service across the Legiones Astartes.