Fate Stay Night Codexery

Third Magic

The forbidden art of perfect duplication that grants eternal life to the chosen.

Third Magic

via Wikipedia: Fate/Stay Night: Unlimited Blade Works (TV series) · see source

The Third Magic is one of the seven legendary Magics created by the original founders of modern magic, known as the Ancestors. Unlike other magics that manipulate external energy or matter, this unique ability allows for the creation of a perfect conceptual copy of any living being, effectively granting true immortality to those who possess it. It is the central goal driving much of the conflict in the Heaven's Feel route, sought after by the Einzbern family and the elusive Kirei Kotomine.

Lore & Background

The Einzbern family dedicated centuries to mastering this art, constructing their fortress in Germany specifically to house the necessary rituals. However, they never fully succeeded in perfecting the magic on their own, leading them to rely on the Holy Grail War as a means to gather enough energy and resources. The tragic irony is that while they sought immortality for themselves, the magic's true nature was often misunderstood by those who pursued it with greed rather than understanding.

Reader's Guide

The Third Magic operates on the principle of 'Conceptual Copying,' where the target's existence is duplicated down to their very soul and memories. This differs from standard cloning because the copy is not a separate entity but a continuation of the original, allowing for true immortality. Historically, only Kischur Zelretch Schweinorg, the master of the Fifth Magic, has successfully utilized this power in conjunction with his own abilities to create duplicates that can traverse parallel worlds.

The Einzberns attempted to replicate this feat using the Holy Grail as a catalyst, believing its accumulated energy could substitute for the missing components. Metaphysically, the magic requires a 'seed' or template of the subject's soul. Without a perfect match in spiritual density, the process fails or results in unstable constructs. This is why the Ancestors deemed it one of the ultimate magics; it defies the natural law of entropy and death.

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