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.

Outwardly, Ah-Un is a very placid and laid back dragon, quite happy to do anything asked of him, and only showing apparent disinterest in anyone he does not like. But within their own heads, it can occasionally be a very different story. Ah, the left head, is both slightly more aggressive and motivated, while Un, the right head, quite lazy and difficult to get moving. This results in the overall placid personality, with Ah motivating Un to do things at all, and Un calming Ah down when he gets cranky. Although they mostly have similar opinions on most things, when they do argue it can last hours, with both heads just glaring at each other as they telepathically argue.

Their mate is Dolia and Belrix Unhill, and together they have several children, but during a bad patch in the relationship, when both Dolia and Belrix decided to kicked out Ah, and by association Un, they fathered a son with Yasashi and Nigami Yobun-Atama.