Shadow Walkers are a strange breed that possess the ability to slip between the planes of reality, becoming immaterial. This allows them to hide in the shadows, either hunting from the concealment of near invisibility or evading enemies. Though they become corporeal to mate or to eat, they spend most of the rest of their lives walking in the shadows. Shadow Walkers are wary creatures, though on dark autumn evenings when the leaves fall to swirl in the chill, rain damp air, they may be seen drifting out from the shadows.

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.

Of all the dragons in his clan, Libby's Patronus is perhaps the most devoted to their human trainer, who most of the dragons only rarely see after they have matured and found their niche within the clan. He considers himself her protector, emerging from the shadows quite suddenly if he considers her in danger, and prefers to hunt with her in case a wild dragon becomes overly protective of the eggs in the faraway caves. When he is not at the human's side, he is often drifting quietly just out of sight near the other dragons, keeping an eye on proceedings and acting as Libby's eyes and ears amidst the clan.