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The Ruby Star is the fourth of the Crystal Stars Mario collects in Paper Mario: The Thousand-Year Door. According to the legend of the Crystal Stars as told by Grifty, the Boo heroine placed the Ruby Star in the Creepy Steeple in an effort to keep it safe. Eventually, Doopliss finds the Ruby Star and starts residing in the Creepy Steeple, using the Ruby Star to amplify his power and turn the residents of Twilight Town into pigs. After Mario defeats Doopliss for the first time, he seemingly collects the Ruby Star, though Doopliss and Mario are soon revealed to have swapped places, with Doopliss acting as Mario and Mario becoming a shadow. Joining up with the Shadow Siren Vivian, Mario defeats Doopliss again and recovers the Ruby Star for real, and Mario learns the move Art Attack to use in battles.
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