Fullmetal Alchemist: Fullmetal Edition, Vol. 10

In an alchemical ritual gone wrong, Edward Elric lost his arm and his leg, and his brother Alphonse became nothing but a soul in a suit of armor. In order to make headway in their quest to become whole, the brothers must first learn about the unjust war that changed their world.

Fullmetal Alchemist: Fullmetal Edition, Volume 10, by Hiromu Arakawa.