Seven Kingdoms: Seowyn's Crossing
Adamantine is a very rare, ultra-hard metal found in Alderoth. It is a dark metallic material with a slightly greenish sheen. It is notoriously difficult to locate and mine, and even more difficult to work with, but the weapons it proposes are among the most valuable in the world, as they take magic very well, never dull, and cut through even some of the hardest enchanted hides of monsters.
According to legend, Cassada Fivebraids spotted strange green lights over the Everfrost Mountains. Leading the dwarves into these mountains, she delved deep, eventually finding the first veins of adamantine. The tunnels they mined eventually flowed with gold and gems due to the legendary metalcraft of the dwarves and became the city of Balgondelve.
Darberik Fivebraids, her distant descendant, has recently set out with a group of sailors and dwarves for the Desolation of Azmartheon. Tales of eerie lights above the desert have convinced him that adamantine may be discoverable there, and he’s staked his small personal fortune on the expedition.