"and the price of immortality"
That does kinda imply that one needs to have the grail with you to remain immortal. That you need to continually re-up the effects by drinking out of it for eternity.
Of course, if that's the case, then what's the point in the first place? And why does there need to be a guardian knight if the only "benefit" is that you get to live in a cave forever? Who cares if the most evil person in the world succeeds in getting there if they can't be immortal outside the cave, and can't steal the grail without causing a cave in?
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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