There are two hidden switches in the castle. One is behind the throne, and another is near the skull on the counter of the Rosenqueen shops. Flip both of them to allow access to Etna's diary, which is in the middle corner of the intermediate hallway between the throne room and the shops. If you visit this area consistently for each chapter, you will be rewarded with a Testament item in the final chapter.
Unlock Majin Class
To unlock the majin class, you need each of the following classes, at level 200: warrior, male brawler, ninja, rogue, and scout. The majin is the best class in the game.
