Entoloma

A poisonous mushroom turned monster. This extremely poisonous mushroom is dangerous to even touch. Similar-looking edible mushrooms also exist, and humans who mistake it for such and attempt to harvest it are set upon one after another by harmful spores. Some people set fire to their clusters in an attempt to eradicate them, but if even a few of these fungi remain they will soon return to their former numbers. No attempt at exterminating them has succeeded so far.