Sapphire Dragons were so named for their brilliant blue-green color, which is reminiscent of the gemstone. This breed was historically hunted for their scales; even long after, they remain distrustful of humans. Normally a Sapphire is not very aggressive, but they will defend themselves vigorously if under attack. Their diet consists mainly of fruit, with smaller portions of large insects and other invertebrates. Males woo females with vocalizations similar to bird songs. Sapphire Dragons are very loyal to their mates, and it is not unusual that they pair for life.

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.

Osumilite walks along the edge of the sapphire territory and a neighboring territory of some gold-horned tangars. She likes to step over the invisible line and announce, "sapphire, tangar, sapphire, tangar, sapphire, tangar" over and over. Her housemates think she isn't very good at border patrol, but none of the other dragons are willing to deal with her incessant chattering back at the cave, especially when they are trying to sleep at night, so Osumilite remains stationed at their land's edge.