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The Star Spirits are a group of seven powerful stars that first appear in Paper Mario. Consisting of Eldstar, Mamar, Skolar, Muskular, Misstar, Klevar and Kalmar, the Star Spirits are being held captive by Bowser's followers after Bowser and Kammy Koopa stole their precious Star Rod and turned them into playing cards, in retaliation for their ignoring Bowser's selfish wishes.
After Mario rescues them, they give him a special power called Star Beam, which is used to neutralize the effects of the Star Rod, and a ship that they can use to travel to Bowser's Castle. During the final battle with Bowser, due to the effects of Bowser's Power Platform, their Star Beam does not work against him, unless Star Beam is upgraded to Peach Beam when Twink helps Mario out in the battle.
The Star Spirits reappear in Mario Party 5, where they are known as Star Guards and guard the Dream Depot and all of its dreams; in addition to slightly updated appearances, their mouths are also no longer visible. They guide the players throughout the game as well. They return as a collectible for Mario Party 5 in Mario Party: The Top 100, where they are once again known as the Star Spirits.
The Star Spirits' Names and powers
Duties in Mario Party 5
Official profile from Mario Party: The Top 100
Mario Party 5
Names in other languages