呈黄色的矿物，易燃且有刺鼻气味。是火药和炼金术的重要原料。 可在黑市出售换取个人资金，或通过营地马车管理员打包成商品，运到贸易管理所售出换取营地资金。
A rare mineral highly valued in alchemy alongside mercury. It has long been sought after for its use in gunpowder production, but its high concentration of brimstone fumes makes mining and transport dangerous. Rare resource found only in the Brimstone Springs, and even discovering it is no easy task.