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There was a man in my world who once said that any sufficiently advanced technology is indistinguishable from magic. [Thanks for reminding him of that one, Julian.] Some people from my world would have trouble even accepting the existence of magic, they may just consider it a more advanced form of science that we have no understanding of.
But if someone unsealed it, then he would die, would he not? Or his spirit would pass on, how ever you want to phrase it?