Reign Of Fire
Cheat mode
At the main menu, press X, Y, White, Black, X, Y, X.
Level skip
At the main menu, press X, Black, Y, Black, X, White, Y.
Invincibility
At the main menu, press White, X, Y, Black, X, Y, Black.
Double damage
At the main menu, press X, Black, X, Y, X, White, X.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original