X-Naut Fortress

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 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.