X-Naut Fortress

X-Naut Fortress is Grodus' main base of operations which is located on the Moon and the home to the X-Naut Legion in Paper Mario: The Thousand-Year Door. This place is also where Princess Peach was taken to. The last Crystal Star, the Crystal Star, is held there. Grodus got to earth and back to his fortress using a Teleportation Machine, which has one end located in his laboratories and the other end located in Rogueport Sewers. The base is also the home of TEC-XX.