Originally Posted by DeepO
I´m not quite sure how they intend the grimoires to work, but it might be pretty cool if these would sometimes come with a prescribed unique spell which is not possible to learn on level ups.

I don't think Wizards will learn spells on level up. Josh Sawyer mentioned finding grimoires (on dead mages) with spells in them. His example was finding a girmoire with cloud kill in it, despite you not being able to use it yet.