An expensive cup, given to royalty, changes the color of the water and has healing properties; reminds me of the holy grail. Is there any connection to the legend?
Certainly not to the usual sources of the grail legends, because they are from the High Middle Ages. Later, well, your very own comment creates a connection.
Clearly, (Mormon) Jesus brought the real grail to the Nephites.
I was half expecting this to be a "ligma" variant.