Your work is often praised for unique magic systems with interesting limitations, like the application of the laws of physics to the abilities of a Coinshot in the Mistborn series. What kinds of limitations do you think have the most potential?
There are lots of ways to go with this answer. It depends on how creative you are with your storytelling. I like to found my magics with certain rules so that I can force myself and my characters to be more creative in their application. I think that a good magic system is going to have some of this. Granted that my way is not the only way; there are a lot of great stories that don’t do magic the way I do it. But if you’re trying to tell a story where the way the magic works is a very big part of the story, then limitations are vital. I would say the best limitations are ones where creativity is forced on the part of the characters.
I don’t like limitations such as kryptonite—this one thing negates the magic, which focuses the story around having it or not having it. I like limitations that are intrinsic to the magic and have a logical sense. When I can, I like the limitations to be bounded by the laws of physics—what requirements will physics put upon this magic that will make the characters have to use it in a more natural way.
The other big thing is that I split out costs and limitations in my head. A limitation is just what the magic can or cannot do, just like we have limits in our own world to what a physical body can achieve. Costs are what you pay for the magic, and these can add an economic component to a book and a magic system; they can add a lot of ties into the setting, and a great magic, I think, has a lot of ties into the setting.
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