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Can I use the term Allomancy (etc) in my work?
I’m flattered you like the concept of Allomancy so much that you want to use it in your work, but I think it would be best if you come up with your own magic system to write about. Any novel or movie that uses Allomancy would be considered a derivative work, and copyright law assigns all rights to derivative works to the original creator. I don’t mind people writing fanfiction for free reading, but if your project is something intended to be marketed as original or for any kind of money, your own original concepts are best.