Grandia II Cheats
Complete the game once and then play it again. New items will appear in various locations.
Book of War
Win the Walnut game six times and you will receive the Book of War when you come back from the game.
Go to the sailor's house when you get to Roan's hometown. Arm wrestle him. If you win he'll give you the information. Then, Arm wrestle Millenia. If you win you will give you the Great Items.
When you get Roan to become a part of your team, exit the palace. Go to Raul Hills, and when you get there, "Special Stage" will appear on the screen. You can train yourself there and leave when you're ready.