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.

By default, when his mate Sylver took over the Nightfyre Pack, Jaymes became alpha male. Much calmer and less violent than his chosen love, it is usually his job within the pack to settle arguments and calm those who oppose her leadership. He knows the control of his mate won't last long, as some of the Vampires and other pack members are already plotting to overthrow her. He can only hope for the best.