Split Dragons use their sharp teeth and wings to hunt large animals and rarely eat plants. They are intelligent dragons who enjoy mental challenges, preferably alone; Split Dragons are normally solitary except during mating season. When mating, many dragons come together in a group to raise their eggs and hatchlings. These groups tend to be very noisy—reminiscent of a thunderstorm—and last only until the hatchlings are capable of surviving on their own.

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.

Two-headed dragons are unique enough to deserve a separate classification from ordinary dragons. They have two necks, two brains, two mouths, but one stomach and one main body. The two heads usually work together, but there are times when they will fight each other, snapping back and forth. Their unique anatomy prevents them from breeding with single-headed dragons.

Darin and Thalis are very noble, honourable entities. They are unfailingly courteous to other dragons, and are serious almost to the point of being dour. They aren't entirely identical, of course, otherwise they'd probably bore each other into insensibility. Darin is an avid star-gazer and loves human music, often coaxing Thalis into sneaking close to human settlements during festivals and celebrations so he can listen. Thalis enjoys philosophical debates, though he can never goad Darin into one, and became fascinated by the human game of chess after witnessing a game through a window during one of Darin's musical outings.

They are both saved from being total sticks-in-the-mud by their light-hearted, laughing lifemates, Lara and Lucy.