Fullmetal Alchemist, Vol. 8

A raid on the Devil's Nest turns into a massacre as government forces led by Führer President King Bradley wipe out Greed's half-human followers, and the Elric brothers are left to wonder whether they can come through the battle unchanged. Then two travelers from the eastern country of Xing, Mei and Ling, arrive in Amestris looking for the Philosopher's Stone and a secret the brothers never imagined.