Episode 31: Sin (2003 series)

In the chaos of the crumbling headquarters, Izumi successfully escapes with the boy. but it's too late- Envy has revealed the truth to the homunculus child, and his personality is quickly changing. With Izumi's secrets exposed as well, the Elric Brothers try to stop her heartbroken plan of atonement, converging on a cold stone alter on a lonely island.