The Holy Grail
Transforming into Super Sailor Moon (manga/anime/Crystal)
Rainbow Moon Heartache
Crisis, Make Up (manga/anime)
The Grail's Divine Power! Moon's Double Transformation (anime)
Its origins and summoning were different both in the original anime and the manga/Crystal.
When Chibiusa was talking about what to make for her art class, she mentioned a weapon that her mother once had that gave her power; a picture of it was in Neo Queen Serenity's room in the future. When Cyprine and Ptilol attacked the Senshi, they used their powers to manipulate the Senshi's suspicion of one another to attack each other. Sailor Moon merged her powers with Sailor Chibi Moon and Tuxedo Mask and was formed, breaking the mind control.
The four Inner Senshi then poured their own planet powers into , and the Outer Senshi poured the power of their talismans into it. Sailor Moon drank from the grail and evolved into Super Sailor Moon and used her much stronger Rainbow Moon Heart Ache attack, destroying Cyprine and Ptilol. She would use the grail again to fight Germatoid, and then against Mistress 9 and Pharaoh 90, with Sailor Chibi Moon gaining a grail of her own and transforming into Super Sailor Chibi Moon. After the Outer Senshi left following the defeat of Pharaoh 90, the Holy Grails lost their divine powers and vanished, due to the Outer Senshi being unable to contribute their own planetary powers for the Super transformation.
It allowed Sailor Moon to evolve into a much more powerful form, becoming Super Sailor Moon. In order to do so she had to first transform into her third evolution of her regular Sailor Moon form and then lift, along with the phrase Crisis, Make Up. Every time she needed to transform, the cup magically materialized in her hands, but she could summon the grail at will and not necessarily to fight.
Episode 125 marked the last appearance of the Grail in the series, when Mistress 9 had used it to summon Pharaoh 90 to Earth (right after she had tricked Sailor Moon into handing it over willingly), who had absorbed it into himself, causing the Grail to shatter.
The actual Holy Grail first appears in "Transformation: Super Sailor Moon" and gives Sailor Moon the ability to evolve into Super Sailor Moon, with even greater powers of the Moon. Like the original anime, the Grail greatly amplifies the healing abilities of the Spiral Heart Moon Rod and enables Super Sailor Moon to exterminate her opponent with a much stronger attack: Rainbow Moon Heartache.
An additional, smaller Holy Grail appears for Sailor Chibi Moon alone in "Upper Atmosphere." After using it to transform into a secondary evolution, Super Sailor Chibi Moon, she then combined her new Super Sailor abilities with those of Super Sailor Moon and performed the combo attack, Rainbow Double Moon Heart Ache, which is tens of times stronger and more effective than Moon Spiral Heart Attack.
In "Infinite Judge", Super Sailor Moon called on the Grail, so that she could release all of its sacred power, along with those of the Silver Crystal, at Pharaoh 90 in an effort to destroy him for good.
A similar item is present in the video game Sailor Moon: Another Story. Both Sailor Moon and Sailor Chibi Moon have one and those items purposes are the same as their manga counterparts: evolve the two Sailor Soldiers into their Super forms.
The Super upgrade grants them with a increase in their statistics, heals them up to 999 hp and the ability to perform Rainbow Moon Heart Ache (Sailor Moon only), Pink Sugar Heart Ache (Chibi Moon only) and Rainbow Double Moon Heart Ache (a link attack). However, they lose all her normal forms' attacks and cannot use any other link technique which involves other Sailor Soldiers.
- In the original English dub, the Grail was renamed the “Purity Chalice”, probably to avoid religious reference and in the original print manga its name was again changed to the “Moon Chalice.”
- According to Christian theology, the Holy Grail was a cup or dish used at the Last Supper by Jesus Christ and supposedly had miraculous powers for healing and goodness. In some tellings, it was also used to catch some of the blood of Christ after he was crucified. The Sailor Moon version of the Holy Grail bears resemblance to the Holy Grail in Christian theology, as it has the power to heal and save people if used by someone with a pure heart.
- The Proplica Version is called the “Rainbow Moon Chalice.”
- A translation of the "Another Story" video game called the "Moon Cup".