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.

Thighbone likes to make fires and watch the things get affected by fire. Sometimes they burn, sometimes the fire is extinguished in seconds, and so on. That's not weird, and he says his so-called explorations are always done safely, except those few times they weren't and one of the neighbors had to put out the fire and possibly reverse some of the damage. Sometimes the damage was to Thighbone. Oops. On the upside, Thighbone smells like savory barbecue rather than rancid meat. He's a researcher at the Bone and Fossil Lab, and though an inquisitive and diligent worker who gets along well with everyone, even the cranky magical implements manager, no one can be sure he won't ever do something stupid like proposing tossing some ancient artifacts into a fire, so there's always someone in early to hide the fire-starters, get the blanket out of storage, and fill the water trough so they're prepared when Thighbone comes in.