The Greater Grailer (大聖杯, Dai Seihai?) is the gateway linked to the Root and the ultimate prize for the Fuyuki Holy Grail War, and is in essence, a wishing machine. Known as the core world, the Cup of Heaven (天の杯, Ten no Sakazuki?), the core of the Grail was formed by Justeaze Lizrich von Einzbern, who continues to remain at its centre. The creation of the Great Grail was done so under the supervision of Kischur Zelretch Schweinorg, the teacher of the three founders of the war, Justica, Makiri Zouken, and Nagato Tohsaka .
The magic circle of the Greater Grail is inscribed upon the land managed by the Tohsaka family in Fuyuki City. Located in the great cave underground of the Ryuudou temple on Mount Enzou, it consists of a series of seals carved on a radius of above 50 meters of bare rock. It is the most ideal location for the Holy Grail to be summoned, though three other locations also exist should the location at Mount Enzou be unavailable. The Greater Grail itself is a system, and the Holy Grail is the key to start it up. The Greater Grail does not have a will and Justicia’s soul was completely sublimated when she sacrifice herself for the ritual . While Holy Grail collects the souls of the Servants, the Greater Grail uses the energy to open a gateway. Though the Lesser Grail is forcibly destroyed by Saber under the command of her master, Kiritsugu Emiya, its corrupted contents spill into the Greater Grail in the form of black mud.
For the Holy Grail Wars, the Greater Grail is what selects the Masters and invites Heroic Spirits, setting them in the Servant class system. After picking a Master from each of the three founding families (the Einzbern, Matou, and Tohsaka), it preferably picks Masters who earnestly want it, although it is possible to have irregulars, like Kirei Kotomine in the fourth Holy Grail War, who has no sense of purpose.
In the Fate and Unlimited Blade Works routes of Fate/stay night, ten years after the Fifth Holy Grail War, the Mages Association planned on bring back the Greater Grail with great opposition from the Church. After the end of a great turmoil with the same magnitude as the Grail War, the Holy Grail in Fuyuki City was dismantled under the direction of Lord El-Melloi II and Rin Tohsaka and the Grail Wars of Fuyuki came to a complete conclusion (this event is indeed canon). In the Heaven's Feel scenario, the Greater Grail is either finally destroyed by Shirou Emiya (normal end) or shut down for good by Illyasviel von Einzbern (true end).
Fate/complete material III - World material - Q: Is the will of the Greater Grail, which selects Masters, the same will of Justicia who was offered as a sacrifice for the ritual that created it? Or does the Greater Grail lack any kind of volition? English | JapaneseA: The Greater Grail does not have a will. Justicia’s soul was completely sublimated.
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