Brimstone, or to give its proper alchemical name sulphur, is a powdery bright-yellow rock which burns with a bright blue flame, gives off poisonous smoke that smells of rotten eggs when set alight, and melts into a glowing red sludge when exposed to high heat. It is an important ingredient in the black powder used in Manzil's explosive weapons and in various medicines from The New Republic of Bēti, as well as for making fertiliser in areas like The Southern Pale where livestock cannot be kept.
The main source of Brimstone on Orth, is near volcanoes in the Dracolich Empire within The Southern Pale.