Volume 25

Fullmetal Alchemist: Volume 25 was released on April 22nd, 2010 in Japan, and June 7th, 2011 in the United States. It was written and drawn by Hiromu Arakawa. The cover features Alphonse in his armored body facing away from the Door of Truth where his original body is standing far behind him. This volume was later followed by the 2nd to last volume, Volume 26.

Synopsis
From the back of the volume:

"As Greed and King Bradley continue their battle, the mysterious homunculus “father” makes his move under Central City. In order to achieve his objectives, he will need to force Mustang to make an unthinkable choice. Meanwhile, Alphonse has the chance to regain his own body, but the sacrifice to do so may be too much."

Chapters

 * Chapter 100: Holding the Gate (開かずの扉, Akazu no Tobira)
 * Chapter 101: The Fifth Human Sacrifice (5人目の人柱, Goninme no Hitobashira)
 * Chapter 102: Before the Portal (扉の前, Tobira no Mae)
 * Chapter 103: For Whom? (誰のため, Dare no Tame)

ISBNs

 * Japan: ISBN 978-4-7575-2840-6
 * America: ISBN 978-1-4215-3924-9