King Wart is supposedly the last boss in Super Mario Bros. 2. In The Invasion 2, Wart is the boss of World 2, Subcon Underground. He is the boss in the Dungeon of Agony. He's a fat frog that can eat Mario and then explode into small bits of toasty hamburger. It's unknown why such cruel thing happens to Wart. Oh. And he also can fart for some reason. Get it? Fart-Wart. This is not a spam I think.