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.

Tilly grew up to the kindest parents in the Weyr- the Mother and Father of the Weyr, Tally and Tully. They took care of all the children and sometimes didn't have time for her- but she grew up well all the same. She tends to the children alongside them and even found a loving husband in Molin Du Boucher, but he isn't quite as interested in the kids as she is. That suits her fine, as she likes to tend to them on her own while he goes out to hunt. She spends a lot of time with her parents, more than most adult children do, and has a very strong bond with them, as well as many of the children of the Weyr. She's a sort of "big sister" to most born in the Weyr after her time, and a little sister to those born before. She's caring and gentle, though a bit quiet, and the dragons of the Weyr know she is always good counsel as she is very thoughtful.