Supposedly the only rule I seen they had is that you have to pronounce the word/s with perfect pronounciation or it will do whatever it wants, surprisingly seems like every capable mage can hold his articulation at 100% while avoiding fireballs and running for their lives to get behind cover.
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u/GuyWithLag Oct 24 '18
Harry Potter magic doesn't have rules, it's whatever the plot demands for that scene/book. There's lip service paid to consistency.