呈現黃色的礦物，易燃且帶有刺鼻氣味，是火藥製作及煉金術的重要原料。 可在貿易品黑市販售換取個人資金，或經營地的馬車管理員包裝成商品後，於貿易管理所販售以補充營地資金。
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.