Assertion: immortality | /r/HasProperty | one of the known limits
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Source sentences:
text: Immortality is one of the known limits to magic; it is nearly impossible to make oneself immortal; the only known and working ways are making and using a mystical object of great power to sustain life (such as the Philosopher's Stone created by Nicolas Flamel or a Horcrux, the latter having been used by Lord Voldemort).