Carapaceons (Japanese 甲殻種) are crustacean-like monsters that have hard shells and exoskeletons or crab-like bodies, which mostly require weapons with at least green sharpness to break. When they're weakened by physical damage, they show internal bleeding by the frothing of the purple bubbles from their mouths. Most of these crustaceans resemble crabs, lobsters or scorpions.