The Holy Grail is an item.  


The Holy Grail (or Purity Chalice) is a sacred Chalice owned by Neo-Queen Serenity when she was young. It gave her mysterious powers during crises and she saved the people. The Holy Grail is very shiny and is decorated with many jewels. It is a divine cup that was handed down since ancient times. It is used to put wine or holy water in for holy ceremonies to purify bodies. It empowers those who drink from it.


"Moon Chalice of lore, filled with the last powers of the nine Sailor Guardians"

Second Holy Grail

A second Holy Grail appeared to Sailor Chibi Moon when she wanted to be more like Sailor Moon.