Valkyrie Profile: Lenneth Cheats

Seraphic Gate
To unlock the bonus dungeon Seraphic Gate beat the game and wait until the scenes after the "Fin" screen. It will give you an option to save. Save your game (it puts you at the last save point in Asgard Hill). Now go to the main menu and you will have an option to go to Seraphic Gate. You must use your completed game save to get in.

Secret Scene
Wait after the credits finish and you will see a scene involving Bramms and Lezard. This can only be posible if you get the A ending.