Noirberus is a large, canine monster with pitch black fur covering its body. It most closely resembles a monstrous mastiff or Rottweiler. Noirberus possesses two small half-skulls, one on each shoulder. There are rings of bony spikes around its neck and ankles, just above each foot. Its long, thick tail is skeletal, as if its spine were poking out of the monster's body. Its eyes, claws, teeth, and nose are crimson in color, as are the insides of its pointed ears.