Magic and Hard SF
In a setting I'm working on, the setting is TL 12 and mostly hard SF. Magic is possible in some solar systems because some stars' heliopauses are filled with an energy called "ki" in the one system in which it's been discovered. It's a recent discovery, and the only supernatural element is the manipulation of ki. So what spells need to be disallowed? Some are obvious; you can't summon demons when there are no demons to summon, and the same applies to elementals. I'm considering allowing elemental creation, with a duration limit and similar prerequisites to Summon Elemental, but I'm not wedded to the idea.
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