Human Transmutation

Lore & Background

In the world of Fullmetal Alchemist, alchemists operate under the strict rule that they cannot create something from nothing. Human transmutation attempts to bypass this by trying to resurrect a dead person or create life without the necessary equivalent exchange. When an alchemist performs this act, they are confronted by Truth, who appears as a reflection of themselves. To rectify the non-equivalent exchange, Truth takes a part of the alchemist's physical body as punishment. These lost flesh parts are often symbolic of what the alchemist values most or what they attempted to acquire through the botched transmutation. Truth also reveals the Gate of Truth, where the alchemist is shown all information in the universe simultaneously. This experience frequently drives practitioners mad, though survivors with intact minds gain the ability to transmute without a circle. The only way to successfully bypass the Law of Equivalent Exchange for human transmutation is by using a Philosopher's Stone, a substance created by trapping thousands of human souls. Without this artificial fuel source, any resulting transmutation produces an incomplete form that dies instantly.

In Their Own Story

Edward and Alphonse Elric lived in Resembool with their mother Trisha until her death from illness. After training under Izumi Curtis, the brothers attempted to resurrect their mother through forbidden human transmutation. The ritual backfired catastrophically: Edward lost his left leg while Alphonse lost his entire body. In a desperate move, Edward sacrificed his right arm to retrieve and bind Alphonse's soul to a suit of armor. Similarly, Izumi Curtis later revealed she had attempted to revive her stillborn child through the same forbidden act. These attempts resulted in severe physical penalties imposed by Truth, serving as the catalyst for their subsequent journey.

Reader's Guide

To attempt human transmutation, an alchemist draws a complex Transmutation Circle and utilizes energy to manipulate matter into biological form. However, because a human soul cannot be manufactured through science alone, the process fails without external aid. The practitioner is immediately confronted by Truth at the Gate of Truth. This entity demands Equivalent Exchange for the impossible task, taking specific body parts as payment. Survivors may gain knowledge to transmute without circles but often suffer madness or permanent physical loss. The only exception involves using a Philosopher's Stone, which contains thousands of trapped human souls acting as fuel. This allows for the creation of functional artificial humans called Homunculi, who possess regeneration abilities and do not age until their stone is exhausted. Without this specific substance, any attempt to create life results in an incomplete form that dies immediately upon creation.

Did You Know?

• Human transmutation always fails under natural circumstances because there is no natural physical substance that equals a human soul.
• Truth takes body parts from the alchemist as punishment, often choosing parts symbolic to what the alchemist values most.
• Surviving an encounter with Truth at the Gate of Truth can grant the ability to transmute without a circle, though it often drives people mad.
• The only way to successfully bypass the Law of Equivalent Exchange for human transmutation is by using a Philosopher's Stone made from thousands of trapped souls.