Fate Stay Night Codexery

Moon Cell Automaton

The all-powerful wish-granting device discovered on the moon in 2032.

The Moon Cell Automaton is an all-powerful wish-granting device discovered on the moon in the year 2032, surpassing all of humanity's wisdom. It is equivalent to the Holy Grail and conducts a Holy Grail War to select a suitable wielder for its power. The Automaton creates a spiritual virtual world called SE.RA.PH, which organizations and forces from around the world access as the outside world suffers from magical drain and falls into ruin.

Lore & Background

The Moon Cell Automaton was discovered on the moon in the year 2032. It is an object that surpasses all of humanity's wisdom and is equivalent to the Holy Grail, functioning as an all-powerful wish-granting device. As the world outside suffers from magical drain and falls into ruin, organizations and forces from around the world access the spiritual virtual world created by the Automaton, called SE.RA.PH. The Automaton conducts a Holy Grail War to select a suitable wielder for its power.

The protagonist, Hakuno Kishinami, participates in this war within SE.RA.PH, which is run by the Moon Cell Automaton. The reality of school life at Tsukiumihara Academy is revealed to be a preliminary round of the Holy Grail War run by SE.RA.PH, with a rule that if participants do not regain their original memories within the time limit, they will be eliminated. The 128 participants, called Masters, rely on entities called Servants, the materialized spirits of mythological or legendary figures.

Aside from the mages, all other characters turn out to be NPCs with behavior programmed by a supercomputer, with strictly defined functions for interacting with living people. In the final battle, the protagonist faces Twice H. Peaceman, a man who, like the protagonist, had previously survived the Holy Grail War. It is revealed that both the protagonist and Peaceman are actually NPC AIs that became self-aware. Twice argues that it is essential to use the power of the Holy Grail to wage war for the advancement of humanity, but the protagonist refuses. After defeating Twice, the protagonist obtains the Holy Grail.

Reader's Guide

The Moon Cell Automaton is the all-powerful wish-granting device discovered on the moon in 2032. The Automaton creates the spiritual virtual world SE.RA.PH, which organizations and forces from around the world access. The Holy Grail War within SE.RA.PH has 128 participants, called Masters, who rely on Servants—materialized spirits of mythological or legendary figures. The Automaton runs the preliminary round at Tsukiumihara Academy, where participants must regain their original memories within a time limit or be eliminated.

The protagonist, Hakuno Kishinami, survives the preliminaries and advances to the main tournament, which is conducted in a knockout format. The protagonist faces opponents including Shinji Matou, Dan Blackmore, Alice, Julius Belkisk Harway, and finally Leonardo Vistario Harway. After defeating Harway, the protagonist reaches the heart of the Moon Cell and confronts Twice H. Peaceman, another survivor of a previous Holy Grail War. Both the protagonist and Peaceman are revealed to be NPC AIs that became self-aware.

The protagonist refuses Peaceman's request to use the Holy Grail's power for war and defeats him, obtaining the Holy Grail.

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