Half mechanized mine, half a forge factory, Dark Iron Forge is a marvel of Yogo engineering, a self-sustaining building that extracts precious metals from the crust of the world, refines them into alloys that are then molded into accessories and jewelry. Once located well outside the city proper, the complex has since been assimilated as part of the 71st district, its almost thousand-foot tall chimneys spewing black smoke and soot high into the atmosphere. Employing more than ten thousand heimin and eta, the facility also sports an extensive factory outlet to sell the mass-produced–and thus quite affordable–accessories designed by Dark Forge artisans. A maglev line connects the factory to the 3rd Mercantile District meaning that no visitor needs to mingle with the lower classes on the way.

Some say that the Yogo have delved too greedily and too deep that they have awoken something lumbering deep beneath the surface; and that the complex is cursed, haunted or both. There are rumors of heimin living near the faculty going missing. The Yogo dismiss any and all such tales as idle rumors, insisting that their facility follows the safety policies of the Scorpion and that the number of 'incidents' are well within tolerances considering the size of the forges.