30 Day Fantasy Challenge Day 3: Rules of Magic!

The month of August has us looking at a pretty exciting area that crosses into a lot of areas of fantasy. There are some specific things throughout it but others that can spread across many mediums and styles to talk about.

Today, we want to talk about the systems and rules of magic! What universe has the best “system”/rules for magic? Which has the worst? Should there even be rules?

Bonus question: If you could have an established magic spell, which would it be?