To get the hidden spell, Teleport (it can't be gotten in any other way), get into a battle somewhere on the Adventure Map. Next, go into your Spellbook and select a spell. Now, press the ''B'' button. After the battle, get into another one and you will see that you have the spell in your Spellbook. Note: This cannot be done in a Siege Battle. It won't hurt your game, but it won't work, either.