Golden Wyverns are known for their beautiful metallic scales and rumored magical abilities. Living high in the mountains, these dragons do not believe in killing for sport or pleasure. They will hunt only when hungry and defend themselves when provoked, but will avoid killing to the best of their abilities. Golden Wyverns often mingle with other dragons of similar color and take pride in their shimmering hide.

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.

A quiet and gentle dragon, Nightmare is one of the many dragons that comprise the Twili Clan. Many passersby often ask Kim or one of the other Twili dragons why his name is 'Nightmare' instead of something more fitting. The reason is that, despite the name seeming to be deceptive at first glance, it becomes very fitting once Nightmare is upset or angry.

By which, if he is in either of those two rather unstable emotional states, they probably should stay out of his line of sight for a few days. For, once he is in that unstable state, he has been known to curse anyone within a good 50 feet of his eyesight with vicious, seemingly real nightmares for months on end. These are progressively worse should one encounter him in the realm held by his clan. Fortunately, this is very rare, so most don't worry about it.

Whenever he isn't helping out the locals in an area, Nightmare often spends most of his time practicing some control over his powers with some of his fellow clan members.