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.

Monstrare is just as nasty as he looks. He is described by others as a "grumpy, suspicious old crank" despite his actually young age. Young hatchlings often mistake his name for "Monster-ary," a name which he grows less and less fond of every generation. "Little fools," he growls, "can't tell a carrot from a potato or a rabbit from an ogre." As you can probably tell, he isn't a fan of youngsters, and, of course, has no good reason for being so. No one knows exactly why he's so unfriendly. He used to be quite sociable and playful in his hatchie days, but one day during adulthood he just suddenly became Mr. Crankypants. He never had any really good friends before, so no one was close enough to him to know what the problem was. Ash Nazg claims to have heard him talking in the forest one day. She says he said, "I wish you hadn't died. Betty I loved you—I still love you—I want you to come back to me!" and then burst into tears. Perhaps he's making it up. Perhaps there really was a Betty.