If you found the discussion of magic below interesting, know that I have just barely scratched the surface. If you’re interested in further, deeper discussion of magic systems in fantasy, and how to make them believable, I have a couple further resources for you to check out.
Holly Lisle has been my go-to source for everything writing related for years. This article is one of the first things of hers I read, and it really opened my eyes to how complex a topic magic can be, and how much more thought I needed to give it.
Around the same time, I bought my copy of Orson Scott Card’s How to Write Science Fiction & Fantasy. Although magic is only a small part of what Card teaches in this book, it stood all my previous thoughts about magic on their head. It taught me an entirely new way of thinking about what magic is and how it relates to the world you are building. For me, it took the thought process that began when I read Holly’s article to the next level.
And you could do worse than to read the rest of the book, too. It’s one of a handful of writing books that I have kept around for years after I first read them, and I still periodically pull it out and read it again. I find something new to think about every time I read it.