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.

Nightfall Avenger, otherwise known as Nightfall, was one of the few dragons who lamented his mother's demise. His father warned him of the dangers of revenge and of his sister, Fear Embodied. Enraged, Nightfall left, angered by what he perceived as his father's cowardice. Grieving and seeking justice, Avenge chanced upon a mourning Magma dragon by the name of Honeyfire. The elder Magma dragon attempted to dissuade Nightfall's quest of vengeance, but to no avail.

Once a friendly dragon, Nightfall Avenger is now consumed by anger, bitterness, and revenge. He will do everything in order to destroy his sister and her half-brother. However, in the many skirmishes and fights, Nightfall has consistently failed. Many times has he escaped from certain death and left a red ribbon trail in the skies. Many times has his resolve only strengthen in fury and wrath.