Both are correct. There are multiple ways to develop your spell work. Either by rolling when you try to cast spells during play (p. 40), or by using Story Points (p. 31). There’s also the option to improve your spell abilities in the library, the classroom, and among your fellow young wizards (pp. 31–32), Multiple routes to the same goal. I’m glad you’re enjoying the game and thanks for your feedback. I’ll think about how to make that clearer. N.