Half-Man, Half-Bull? Surely you’re joking. But if it’s Dungeon Crawling you need to do there’s nobody better than The Minotaurs.
Actually a real-world fungus, just heard about it. A fungus that tastes well and all, no ill effects. UNLESS you consume some beverage, even 3 (three) days after eating it. Then you become really sick, pains, vomiting, all the fancy stuff. Was really used to cure alcoholism. May be a joke or to make sure the heroes spend their time focused on the mission.