It's something I came up with for a set of novels I have planned, the first one being already published. To give a bit of backstory on the world...

It's taken a lot of inspiration from various anime, as well as some other things like superhero fiction I enjoyed and certain other tv shows like Avatar: The Last Airbender. Though I don't go into great detail much in this story, the magic system "casting" is very easy to parallel with "bending"(from Avatar). The Inverse itself, where the characters currently are, has a lot of significance in relation to casting, but telling any more would be considered spoilers.