A Few Words About Magic in Fiction

Magic (as I'm loosely defining it here) features heavily in fantasy. The forms magic can take from one fantasy story to another, however, greatly vary. If you think I'm going to give you an exhaustive break-down of all the kinds of magic that appear in fantasy fiction, you're sadly mistaken because I have neither the time nor the inclination do so, but I do want to try and break down what it takes to construct a good one as Sanderson has.