Brimstone is a magical substance. Brimstone is described as a smoking, glowing red rock. Owning Brimstone requires a permit, and owning it without one is considered a federal crime. The wizard Beifar Mahgo encountered Brimstone when he was trapped inside of Lord Alex's office after being whacked by an Emunio Concutio at Alex's company's building. Lord Alex had the Brimstone in a wooden bowel. When Beifar saw it he claimed that Lord Alex did not have a permit.