A colloquialism coined to describe the peculiar breed of undead commonly found in and around the Cinderlands.
Mordan’s dark magic animates his minions in such a way that their heads are seemingly filled with violet fire, flooding from their mouths, eyes, and noses. These tell-tale spots of violet light in the darkness are often the only warning of an impending attack.
They seem move slowly and mindlessly unless driven by a Cinderwight.
The magic that animates the Jacks has proven itself to be virulently contagious, a victim rising within only a few hours to join the horde.