Spinel Wyverns are small, sleek dragons that zealously collect spinel gemstones to line their nests. They are very affectionate with those they bond with, and will happily spend hours grooming a dragon of a different species if allowed to. Spinels are well-known for their even temperament, but when offended, they are very slow to forgive and will never forget. These wyverns will readily perform tasks in exchange for spinels, and occasionally other stones. Occasionally, they can be born with iridescent pale green scales instead of the usual rich red-violet.

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.

Mycroft not only collects spinels, he also collects diamonds. Some say he does this because of his close bond with his father, who is a Diamondwing. Mycroft himself claims that spinels and diamonds belong to the same "stone group", according to his own geological studies and scientific experiments, which he will happily talk about for hours on end to anyone willing to listen. He can seem a little self-important and eccentric, but he is very popular among sufferers of insomnia.