Fullmetal Alchemist: Fullmetal Edition, Vol. 12

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. While the brothers seek answers in the north, they are blackmailed into aiding their adversaries in a plot that threatens the entire country.

Fullmetal Alchemist: Fullmetal Edition, Volume 12, by Hiromu Arakawa.