Star Rod (Mario Party 8)
From the Super Mario Wiki
The Star Rod is a magic wand that appears as the reward for becoming the Super Star of the Star Carnival in Mario Party 8. After completing the game's Star Battle mode, MC Ballyhoo will award the player with not only a year's supply of Candy, but the Star Rod itself, which he had been carrying in Big Top all this time. However, Bowser swoops down and steals the rod, claiming he's the real Superstar. The player then chases Bowser to an area called Bowser's Warped Orbit, where it is recovered after a long battle. This form of the Star Rod has not yet shown any true power aside from the fact that it is able to attack Bowser in the minigame Superstar Showdown.