Wormwould is a worm boss found in Wario Land 3. It's located in The Grasslands guarding the Grey Treasure.
His main attack is to spit rocks to hit Wario. If Wario's hit, he'll have to restart again. To defeat it, Wario has to use his Ground Pound on Wormwould's head. When hit three times, it'll fail and then, some vines will be grown to allow Wario to get the first music box