MELF'S Acid Arrow (Example)
Could there be special Wizards in the world that you have to talk to before being able to cast a certain Spell? Cool I found Melf's Acid Arrow but... I have NO idea how to use it at all so it just sits in my Grimoire. Whenever I try it just fizzles. I would have to find this Melf and he would teach me. Same thing for other spells and magic. Now, the Spells in P:E will hardly have the same the NAMES as the D&D equivalent (some might?).
That scroll you found randomly or by chance somewhere but can't use could hold the powers of the Ultimate Ultimate spell. There could be a clue on the scroll on "How to unlock potential" which leads to another Clue, leading to another Clue, finally finding the Wizard behind it all and you get to learn the super duper omega vega sega Spell that simply obliterates.
Perhaps you have to take the Scroll to the Spell Forge in New York (appearantly, that's a printing press btw). Only at the Spell Forge can the last piece of Magic be printed onto the Scroll in a way only the Spell Forge can.
Thoughts?