Bright-Breasted Wyverns are a breed of dragon easily recognized by their bright red markings. They are a small breed, only the size of a full-grown man. However, they have developed poisonous barbs on their feet to make up for their size. Their coloration is used to warn off potential predators of the danger, and is also used to attract mates. They are very social, and can often be seen preening in large groups.

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.

Edna is a daughter of Masayuki and Mitsuko. She was raised alongside her older brothers Yamir, Tiqvah, and Nux-me. She is the baby of the bunch, and the only girl. They all arrived in the colony together as hatchlings, with the boys looking out for their newly hatched sister. They were then found and taken in by their parents. Edna's name means "Delight, Pleasure".