Teonanacatl

A hallucinogenic mushroom turned monster. Care needs to be taken not to inhale its spores as it can cause harm to the human body. There is record that, back in the days when medicine was still in development, the cap of these mushrooms were used as pain relievers, but patients who took too much of them went berserk from its hallucinogenic effects, so they were banned by the powers that be from use.