Gaining More Experience
If you want to level up faster, just throw your enemies into each other, so they will combine into bigger enemies who are worth more experience points.
How to level up faster
Once you open up the area "Cave of Ordeals". Go through it until you reach the 3rd area. Here you will find 3x3 rows of enemies and the field has a "Exp 50%" Geo panel on it. If you can use a 3x3 attack to kill all the enemies in this stage in one swoop, your character will level up insane amounts. You can take a level 1 character to level 200 if they have a high enough attack. Also be warned that the enemies in this stage have high defense, either bring out other members to weaken the monsters up or you can have one warrior bravehearted by a team of mages.
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.
Etna's Diary
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.
