Even fictional plumber’s have nightmares. And if Mario does in fact dream, this is 1-Down Mushroom is surely the culprit that keeps him up at night. While he’s never actually seen one in the wild (or so he tells the cops), in fact their actual existence is questionable, his mother used to tell him that if he didn’t go to sleep on time, the 1-Down Mushroom would get him. Those sort of scars never heal.
Created by DeviantArt user Undead Ed, the 1-Down Mushroom is a rotting, zombie-esque, festering toadstool, with only one motive on its mushy mind – diminishing your lives by one.