Bonuses after completing the game  -  Complete the game and save. Now at the title screen there will be a new Extras option that has things like Theater Mode and Names List.

Load your cleared game file to access the following new trials at Dragon's Nest: Legendary Class Puni, Legendary Class Demon Beast, Legendary Class Spirit, Legendary Class Fallen Angel, Legendary Class Mushroom King, Legendary Class Demon God, Legendary Class Immortal, Legendary Class Demon Dragon, Legendary Class Darkness Family and Relations, and Legendary Class Weapon.

Ultimate Trial - To unlock the ultimate trial you will need to complete all 19 original trials and 10 extra trials (ones that unlock after beating the game).