As the eclipse begins, Father successfully activates the circle, briefly attaining godhood. However, the tide turns due to a counter-alchemical circle planted years prior by Van Hohenheim and a separate effort by Scar to activate a circle that returns the stolen souls to their rightful owners.

In a climactic act of brotherly love, Alphonse sacrifices his own soul to restore Edward’s original right arm. With his limb returned, Edward delivers the final blow that forces Father back to the Gate of Truth, where "Truth" himself drags the villain into eternal void for his arrogance.

To bring Alphonse back from the Gate, Edward performs his "Final Transmutation." He realizes that his ability to use alchemy—the very thing he defined himself by—is what separates him from his brother and humanity. In front of Truth, Edward willingly , losing his powers forever in exchange for Al's physical return. Aftermath and Legacy

To trigger this, he requires five "human sacrifices"—powerful alchemists who have seen the Truth by attempting human transmutation. These sacrifices include , their father Van Hohenheim , Izumi Curtis , and Roy Mustang (who is forced into the act against his will). The Final Battle

The narrative culminates on the "Promised Day," a catastrophic event orchestrated by the first homunculus, known as . Father intends to use a massive nationwide transmutation circle and a solar eclipse to absorb the souls of everyone in Amestris, effectively turning himself into a god.

The story of Fullmetal Alchemist: Final Transmutation (also titled The Final Alchemy ) serves as the epic conclusion to the live-action film trilogy, adapting the final chapters of Hiromu Arakawa's manga.

The battle shifts into a brutal confrontation where Edward and his allies fight to deplete Father's remaining energy. During the struggle, Edward's automail arm is destroyed, leaving him defenseless against Father's final assault.