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.

Foul-smelling and vicious as they are, marrows are not the type of dragon one would expect to find in a king's throne room... and yet she is there. She is always there, coiled lovingly around the king's throne and purring sweet lies into his dull mind. Many laws has she seen him implement at her suggestion, laws about taxes, about lying, about looking too ugly—laws on anything and everything. Whether the laws are fair or not is of little matter, and whether or not the convicted actually broke them isn't especially important. What does matter is that punishment be carried out and that punishment just so happens to be death, no matter the severity of the crime. The people might complain, but as she takes her fill of the corpses, she finds it quite the perfect system.