Black Marrows are named for their dark colored hides which are encased in a distinct exoskeleton. Their skull and the top edges of their spine push out from under the skin as they age. As such, their young need excessive amounts of calcium for this armor to develop. The older a Black Marrow dragon is, the more skeletal their appearance. They often use their skeletal looks to lure in foolish scavengers or terrify predators. These vicious dragons love nothing more than to crack open bones with their stony beaks and eat the marrow inside. Voracious scavengers, Black Marrows will swarm and devour corpses both old and fresh, sometimes even dragging larger finds to the water to allow them to “ripen.” Despite their dreadful demeanour and often horrid stench, Black Marrows are devoted mates and parents.

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.

It's a Thriller has a dance that is meant to impress. He's studied the shambling of a number of undead dragons—out of their view and sniffing range—to learn about their movements. Then, in the privacy of his dank cavern that no one visits, he turned several of those into a dance. If he smells like a corpse, he might as well dance like one... sort of. It's a Thriller shows off his elaborate, wild-eyed dance to anybody patient enough to stick around and especially loves presenting his work at night. His "thrilling" performance is supposed to provoke awe in viewers and be an influence for years to come, but most dragons think he looks silly.