Caligene Dragons have long been considered omens of death—reinforced by the skeletal markings on their bodies. They exert a malignant force on the world around them, causing other living things to slowly waste away in their presence. Caligenes favor the seasons of summer and autumn, disappearing entirely from the forests they inhabit during winter and spring. These malevolent dragons are physically weak, though this is countered by their natural stealthiness and alarming speed—enabling them to close in on large targets quickly and silently to create ambushes from which prey cannot escape.

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.

Nimiane's favorite places are dark, desolate, and dead. She considers these "the three D's." She will find some nice woods, suck all the life out of them, and use the power built up inside her from doing so to block the sunlight from that area. Anyone and anything that wanders inside her boundaries dies a slow and painful death. As their life is slowly sucked away, she gains new strength. The only thing she keeps alive is a white cat with a black face, which she uses as eyes since she herself is blind.