In the latter days of the great crusade, the Imperium’s manufacturing capacity was vast, on a scale unknown after the fall into the Age of Darkness. The web of Forge Worlds under the Mechanicum’s aegis extended from Mars to the far reaches of known space, each producing arms for the armies of the Imperium, their very best going to the Space Marine Legions. This munificence of resource led to a proliferation of weapon patterns, each unique but harking back to a standard template. Those produced on Atar-Merdian were comonly known as Mediant pattern.