The Crystal Star is the final Crystal Star in the game Paper Mario: The Thousand-Year Door. It is found in X-Naut HQ and is guarded by Lord Crump and powders the new and improved Magnus Von Grapple 2.0. Grodus already took this Crystal Star in Rogueport, so Mario and company had to fight Crump to get it. This Crystal Star will teach Mario the move "Supernova", which costs 6 SP. Do not confuse this with Crystal Stars, the term for the whole group. To use this move, the player must simply tap the A button as fast as possible to rack up damage. If performed perfectly, it will cause 15HP damage.