Concept: an upper limit to how much magic you can use to heal someone
Like how desperately chugging gallons of water in a span of minutes will kill you, how eating far too much food than you're used to can make you sick- in similarly extreme cases, casting too much magic to heal someone from serious injury can cause more problems than you're trying to fix.
Sudden onset of fever and chills, burns, after a certain point the body may just outright reject the magic being applied so that it has no affect.
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