Edward and his brother Alphonse too miss the death of the mother , contrary to private resurrection of this alchemy taboo , body Tempered . Make failure , however , Edward lost his left leg , and Alphonse lost body . Brother struggled with his right arm brother's soul is fixed in the armor , however, the price they pay is too great . Edward and his brother , in order to recover lost , began to embark on a journey to find the Sage Stone . Right arm and left leg replaced with a steel prosthetic mechanical armor " Edward , known as the " Fullmetal Alchemist " .