Triple Threat: Fluttermouth
It's a butterfly. It's so pretty. It's sooooo colorful...and then it opens its mouth and tries to eat you. You kill it. It explodes. And days later your skin starts to move on its on. There is something in you. Something eating you from the inside out. With stats for generic campaigns, Dungeon Fantasy, and Monster Hunters, these psychedelic flying mushrooms are going to make your players cringe and hope to God they never encounter them a second time. I call it the flutterby effect.