The Holy Grail (聖杯, Seihai)? is an enemy in Persona 5.
The holy cup of Jesus Christ, said to be blessed due to him drinking from it during the Last Supper. It is rumored bestow immortality upon those who drink from it along with other miracles. Galahad is sent by King Arthur to search for it in Arthurian myth. Dagda's Cauldron from Celtic myth is commonly associated with and mistaken for the Holy Grail.
The original form of Yaldabaoth that resides at the bottom of Mementos. A black metal cup filled with the blood red wishes of humans who desire to be enslaved to order and authority which is why that the underground Palace is a prison for the Shadow Selves that's been reformed. The Phantom Thieves of Hearts fight the Grail on December 24th, but the constant flow of wishes for Yaldabaoth to take control of the world heal it faster than they can damage it, and turning it into a golden cup as the fight progresses.
Restored to glory the cup begins the plans for salvation upon humanity, tossing the Phantom Thieves back to reality as Mementos fuses with the earth and those with chaos are removed from it, coming very close to erasing both the Phantom Thieves and the Confidant from existence, only stopped at the last minute by Yuuki Mishima convincing his website that the Thieves actually exist and forcing Yaldabaoth to accept their continued being until he kills them the normal way. The thieves fight through the transformed Tokyo and his archangel heralds to fight it once again. A member severs the connection between him and humanity to allow him to be hurt, after which the cup transforms its body in a mechanical manner to become the angelic Yaldabaoth.
The Holy Grail is fought twice in the final heist. The Holy Grail mainly attacks using Almighty damaging attacks. Its most notable move is Will of the People, which fully recovers its health when used.
Upon reaching the bottom of Mementos, the Holy Grail has a black appearance. During this first battle, it cannot be defeated, thus the player must survive a few turns by attacking it to prompt the use of Will of the People. Each use of this skill will slowly change its coloration; once its condition changes to gold, the battle ends and the party is expelled from Mementos.
The player will encounter and fight him a second time. The Holy Grail begins by using Will of the People, prompting the player to give a Special Order to cut the supply lines connected to the cup, thus disabling its ability to use Will of the People. Like other Special Orders, this takes three rounds to fully execute and requires that the player continue to attack it to keep it distracted. Once the supply lines has been cut, the real battle can begin. He retains the same attack patterns as his first fight, but with more variety. Since it has no weaknesses or resistances, the player can attack it with their preferred strategies. Its most dangerous attack is Eternal Light which is telegraphed by its use of Gathering Light. Guarding against this will mitigate the damage. Other than that, this fight is mainly a slugfest. Maintain health and use proper tactics and the fight should be a short one.
Once the Grail is defeated, the battle will progress to the final fight against Yaldabaoth. There is no opportunity to save or heal between the bosses, so take care not to needlessly waste SP.
- In Shin Megami Tensei IV, Dagda's Cauldron is mistaken for the Holy Grail by the angels.
- In the Japanese version, its unique skill "Eternal Light" (聖杯無尽光*)? shares the name with the unique race and skill of Kagutsuchi from Shin Megami Tensei III: Nocturne which are localized as "Light" (race title) and "Vast Light" (skill) in the English version.
- The Fuhrer of Persona 2: Innocent Sin uses the Holy Grail as an attack, granting him invincibility for a few turns.