Holiday dragons are a very mysterious breed. They are only seen during winter, and even then it is hard to catch a glimpse of one. They are responsible for the general cheer that spreads during the holidays. In essence, they are the “Spirits of Winter.”

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.

Named after one of Zeus' lovers and one of the Jupiter's moons, Io likes to play hide and seek. Although she is bad in finding others, she is champion in hiding. It is said that there was only one dragon who managed to find her once and the search took a whole year.

On Christmas Eve, she likes to dance under the moonlight and to listen to the bell's ringing.