Nocturne Dragons are a strange breed. Whenever light strikes their bodies, they are frozen in whatever position they were in. This leaves them vulnerable and they rely on camouflage to keep themselves safe. They are often mistaken for statues when in this frozen state, but Nocturne dragons do not actually turn into stone. Rather, they merely idle until the sun goes down. At night, these dragons come to life, proving themselves to be powerful fliers, although little else is known about their true behavior.

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.

Her name means "Stone Heart". Cor Lapideum is a fearless dragon; she constantly watches out for her Tribe, and takes care of the younger dragons. In her Tribe, she's the most skilled in fighting, alongside Dreamy Nightmare, though she tends to stay in the darkness of the cave during daylight hours so that she may remain awake to guard the cave while the others are out hunting. Many times, she is the only dragon that can exercise enough control over Death's Whip to keep him in his place.