Cornello, realizing now why Edward was granted such a fearsome moniker as "Fullmetal", chastises the boys for clearly having committed alchemy's greatest taboo - Human Transmutation. Alphonse explains to Rosé that he and his brother had performed Human Transmutation several years ago in an attempt to resurrect their late mother, but when the ritual failed, Ed's left leg as well as Al's entire body were lost - broken down by the alchemical forces of whose control they had lost. Alphonse had lost consciousness after that, but when he awoke, he found himself a mere soul housed inside a suit of armor, the result of a rushed transmutation that Edward had sacrificed his right arm to perform. Edward informs Rosé that their current state was the result of trifling with the powers of life and death