Not being able to leave with the cup doesn't to me imply that it has no value for immortality. If all drinking from it does is heal you, couldn't you return every 10 years for a rejuvenating sip? And if you do have to stay there, is it necessary for the dingy cave to remain a dingy cave? Tear down the mountain, build a fortress, and particularly in another 30 years start living a fully connected if admittedly physical restrained life.
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