sentences:  The newly liberated king and queen, Mallow's parents, inform the group that they saw a star fall into the nearby volcano.After traveling to Barrel Volcano to obtain the 6th Star Piece, Mario's party learns that the final piece must be held by Smithy in Bowser's castle.They battle their way through the assembled enemies to enter the castle, where they discover that Exor is actually a gateway to Smithy's factory, the place Smithy mass-produces his army.