The Holy Grail War.
A battle fought over the omnipotent wish-granting device said to be capable of fulfilling any wish.
Of such conflicts, the most famous was undoubtedly the war waged in "Fuyuki."
On an island nation in the Far East lay a city known as Fuyuki City.
Within this city were three mage families known as the Three Founding Families.
Those three mage families were the Tohsaka, Makiri, and Einzbern.
For their own respective purposes, these three mage families had used Fuyuki City as the stage to construct a ritual known as the Holy Grail War.
Though the true nature of the Holy Grail was unknown, the Three Founding Families used the spiritual veins beneath Fuyuki City and the large-scale ritual magic circle constructed by Einzbern to gather the immense magical energy required for the ritual, holding a grand ceremony capable of manifesting the omnipotent wish-granting device known as the Holy Grail.
That large-scale ritual magic circle was known as the Greater Grail.
When the Greater Grail gathered enough magical energy to conduct the ritual, it would select seven magi, making them Masters and having them summon seven Servants.
Heroes who had left behind illustrious names in history and myth would become Heroic Spirits after death, journeying to the Throne of Heroes beyond the world and becoming pillars that upheld the world.
Only the world itself could summon Heroic Spirits.
With their own abilities, magi might be able to borrow a small portion of a Heroic Spirit's power and thus perform miracles, but only the world itself could summon the Heroic Spirit's true body.
Yet the Holy Grail War in Fuyuki City could use the power of the Greater Grail to connect to the Throne of Heroes. With seven Masters providing magical energy, it could summon Heroic Spirits into