Brimstone Dragons live in dry arid areas such as deserts where they feed mainly on sheep, goats and the occasional camel. Their favorite habitat is ideally situated close to the wastelands around active volcanoes. This is due to an important part of their diet—sulfur, which they obtain from deposits near volcanic gas vents. Instead of fire, these dragons use the sulfur they ingest to create a noxious gas which they store in their large throat pouches. When in danger, this gas is released in a large cloud. They also eat other mineral rich substances—including charcoal—and will drink the mineral rich (but slightly acidic) water commonly found in deserts and volcanic regions.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

This dragon, known only as "Henderson", lives alone in a secluded cave. He's painted one wall to resemble a beach, and spends hours staring at it. He has a strange obsession with statues of small creatures, which he calls "lawn gnomes". Each statue in his collection has a name, though most of them are simply referred to as "Charlie". Henderson's only companions are the gnomes and a stuffed parrot named Rupert. Other dragons are slightly frightened by Henderson, correctly assuming that he is insane. Henderson believes that the rest of the dragons are after his statues, and will chase off any that are brave enough to approach his lair, screaming at them in a nearly incomprehensible accent to stay away from his gnomes. He then retreats to his cave, mumbling "Hastur" under his breath.