Infernal iron

Infernal iron was a metallic substance that was found in the Nine Hells.

Applications
This type of metal was used to forge a variety of hellish items, including:
 * Battle standard of infernal power, hellish banners that imbued the weapons of its carrier's allies with magical energy
 * Hellfire weapons, those weapons that claimed the souls of those they slew and directed them to the Styx river
 * Infernal war machine, soul-powered vehicles that were often ridden across the wastelands of Avernus
 * Shattersticks, a non–magical rod that created small, concentrated earthquake
 * Soul coins, a form of currency commonly used throughout the Nine Hells
 * Steel watchers, constructs conceived of and created by Gondians of Baldur's Gate for Enver Gortash.

Among the unique objects made from infernal iron were:
 * The gargantuan spikes and chains that bound the city of Elturel to Avernus

Production
Some of the locations where infernal iron was known to be mined was Cania, the 8 layer of the Nine Hells and Dis, the 2 layer.