It's something like another biological system that you're either born with or you aren't. Everyone's born with a nervous system, a circulatory system, all those, but the magic circuits that control the production and flow of prana only exist within certain people. It's like how you couldn't pump blood without a heart. One of the reasons my magic sucked so hard back home is because mine's nothing special, the same way someone might be born with a heart defect. It's not something you can gain, get rid of, or change.
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