I would argue that having a stamina bar rather than using HP or MP for magic would work: make it like Soulslikes, and have normal attacks use SP for attacks, and magic reduce max SP to 50%. once it hits that, use HP for spells (until the next bonfire, because this is Eragon, and we need to crib from everything).
But that's just my two cents, on something I'm more qualified on than sporking books.
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I would argue that having a stamina bar rather than using HP or MP for magic would work: make it like Soulslikes, and have normal attacks use SP for attacks, and magic reduce max SP to 50%. once it hits that, use HP for spells (until the next bonfire, because this is Eragon, and we need to crib from everything).
But that's just my two cents, on something I'm more qualified on than sporking books.