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.

Five Days Darkness is even more sensitive to sunlight than most Sunset dragons, and thus rises to go about his business only after the last rays of the sun have left the sky. It saddens him greatly that he can't be in the presence of his twin sister, Unconquered Sun, as she rises so early that she's always asleep by the time he gets up, and he can never abide the sunrise long enough to see her in the morning. He, too, strives to rid the world (but more especially, his caves) of evil creatures, and uses his own habits as a creature of darkness to advantage in service of his goal. If there is something Unconquered Sun would love to see done but cannot stomach the means to do, Five Days Darkness is likely involved. He also steps in to help the Solar dragons at every opportunity, using all his wiles to get them to accept his help. He strives to convince the day-flying dragons that darkness, the creatures who inhabit it, and evil are not all related; some refuse to believe him.