Mahoutsukai Precure! EP20 - Super Terrible Fall! The Emerald that is Born within the Magical Realm!

The Headmaster appears before Dokuroxy and Yamoh, but is confronted by Batty. Meanwhile, Mirai and Riko discover that the door responds to whatever they are thinking about, and soon wind up in Dokuroxy's hideout as well. The Headmaster recognises Dokuroxy as his old friend, Kushi, who used forbidden magic to try and obtain the Linkle Stone Emerald. The Headmaster attempts to fight but is overwhelmed by Dokuroxy's dark magic, which causes him to grow old. Dokuroxy then steals the Linkle Smarthon with Ha-chan inside, prompting the Cures to fight against him. Just then, the Linkle Stone Emerald awakens and sends power to the Linkle Smarthon, which Dokuroxy infuses into himself to become all-powerful.