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.

Houdumix lives on the same mountain as Shaydow, Cyanhart Peak, but remains on the outside. She hunts for seekers of the treasure that is supposed to lie deep within the mount's twisting caverns. Houdimix has not eaten fresh meat since she hollowed out her 'garden', a small lake near the peak that she throws corpses in to enhance their flavor. She has been trying to learn necromancy, as she prefers her meals freshly zombified. However, she has been unable to find one willing to teach her.

Were she socially inclined, or had anyone to talk to, Houdimix would reveal herself to be quite cynical and prone to mean-hearted, unfunny jokes. She would complain about doing things for people, and make minimal efforts to be social. Some who have managed to talk instead of fight her have regretted the act. Recently, she has not been getting as much meat due to the pair of cavern lurkers that recently moved on to the mountain. She has not been affected too much, though.