Nupperibo are shambling, ambulatory meat sacks - vaguely humanoid blobs of pus and flesh with a putrid yellow-green pallor - with the horrified faces of the accursed damned. Damned souls raised from the Styx to do the bidding of the princes of Hell, nuperribo are largely mindless and attack in mobs with found weapons or slashes from their rotted claws. They stand five feet tall and weigh about 100 pounds.

Devils constantly punish these tortured spirits, which they consider even lowlier than lemures and manes. Nupperibos are used as fodder in their never-ending wars, with a typical nupperibo army consisting of thousands of these creatures. Nupperibos unerringly follow the orders of their commander. They are relentless in their pursuit and attack, and continue to assault anything in their path until ordered to stop by their commander. A nupperibo killed in battle is 99% likely to be reformed (by a duke or arch devil) into another nupperibo; the remaining 1% are "promoted" to lemure status, having proved their worth in combat.