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.

Midnight Screech is the leader of a group of Black Marrow dragons whose chief feeding strategy is to follow warring dragons around so they can "clean up" after the battles. Her job is to find the battles and then watch them, and to alert the rest of the flock when the last living dragon leaves the scene. She makes sure the younger members of the group get to eat before doing so herself.

She is the much younger mate of Skeletal Click, and goes along with his habit of adopting every stray hatchling they come across. She treats these adoptees like her own children, and cares for them as best she can.