Crystal Star

The Crystal Star is the seventh and final of the Crystal Stars Mario collects in Paper Mario: The Thousand-Year Door, obtained upon completion of Chapter 7: Mario Shoots the Moon.

Originally, the Crystal Star was kept hidden in Rogueport, but Grodus and the X-Nauts found it and took it to their fortress on the Moon. Following Chapter 6, after Mario and his team find the Garnet Star in Poshley Heights after Beldam, Marilyn and Doopliss were tricked with a fake one when they broke into the Poshley Sanctum to steal it, Grodus, after shutting down TEC upon learning about his betrayal, decided to forget about following Mario and his team to steal the other Stars from them and let them open the Thousand-Year Door for him as long as he had this Star in his possession. After going through the door into the Palace of Shadow, Grodus handed over operations of the X-Naut Fortress to Lord Crump, having him guard the Star and knowing he would screw up after the fact. After reaching the moon through Grande Boom in Fahr Outpost, then navigating the X-Naut Fortress, Mario and his partners have to fight Lord Crump in the Magnus von Grapple 2.0 mech suit to recover the stolen Crystal Star and pursue Grodus through the Palace of Shadow after TEC tells the heroes what happened before their arrival. The Crystal Star teaches Mario the move Supernova upon collecting it.

During the final battle with the Shadow Queen, when the Crystal Stars spread out to the locations as to where they were found, the Star does not return to where it was originally found in Rogueport, but instead retreats to Fahr Outpost, alerting the mayor of the crisis Mario and his team were facing. It is during this time, the mayor and his assistant assemble the Bob-ombs that operated the cannon's firing chambers as a cheering section for the heroes, just before they defeat the evil queen once and for all.

Trivia
Kristallstern Stella Cristallo