The K-12 Claimholders grew from the investors who drained the old quarry and financed its pumps. Their first triumph was opening an iron seam that had been written off as inaccessible. They used those profits to purchase drilling gear, hire Drow overseers, and secure labor contracts with Oread crews. The contracts were presented as temporary advances against future wages. Their defining watershed came during the Siltfall, when a seasonal melt surge overwhelmed several channels. The Claimholders diverted water through their quarry to protect their pumps and ore stores. The diversion prevented a catastrophic flood in their workings, but left neighboring camps short of clean water. The consortium later paid for repairs and called the matter settled. Residents of the affected camps remember it as the moment a private claim became a public threat. As the mines expanded, debt agreements began to include water, air, food, and tool charges. The Claimholders became indispensable to small settlements while making repayment increasingly difficult. A failed seam and a costly tunnel collapse briefly weakened them, but new mithral and adamantine finds restored their influence. Today they present themselves as practical stewards of dangerous resources. Their critics see a company that has learned to profit from every shortage it helps create.

The Iron-Bourse occupies the drained chambers of Sector K-12 Deep Quarry. Iron walkways cross the old sump, where water still ticks from the rock into collection cisterns. A public assay counter and contract hall face the entrance; behind them, barred lifts descend to private counting rooms, ore vaults, and a map chamber where claim boundaries are revised in chalk. The headquarters' boastful name once promised that every worker would find a fair price for their labor. Now most who enter come to learn what they owe.