Sunset Dragons are closely related to sunrise dragons. However, their behaviors differ greatly. Sunset Dragons generally live alone or in small packs. They are more active in the evening, hunting and performing all of their daily tasks as the sun sets.

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.

Kiominagi is knowingly involved in possibly one of the deadliest games yet invented: "Fear The Night". She knows the game well and awaits each sunset for it, hoping that eve will be one of the times the fools decide to participate. The stakes are always high, but so are the rewards. How the game works is a large group of people (usually very rich or have rich backers) gather outside of her cave as dusk nears. The moment the sun sets, a loud roar is heard from her to indicate the "game" has begun. The people then scramble to evade the dragon's hunting skills. Any caught are devoured (often messily). Once a number of deaths has been reached (she counts down the amount left before the end, which varies each game), the winners then each get a small part of her huge hoard. Between hunts, outsiders leave livestock tied up near her cave. Sometimes she'll thank those providing for her, giving a crimson-stained smile that few have not been unnerved by, but none would dare say so to her face.