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. Sailor Moon first uses the grail act 33 to transform into Super Sailor Moon. Super Sailor Moon is then able to use Rainbow Moon Heartache attack with the Spiral Heart Moon Rod at the enemy.
"Moon Chalice of lore, filled with the last powers of the nine Sailor Guardians"