Mustang, Alphonse, Havoc, and Hawkeye split up to search a military laboratory. If Lust has her way, none of them will ever see each other alive again.

After investigating the twisted roots of the Bradley family tree, Mustang gathers his most loyal troops. Meanwhile, Ed and his allies continue fighting Selim, who shocks everyone by turning on his own kind.

When the battle ends, the one known as Father meets his final fate beyond the Gateway. When the one known as Fullmetal enters the sacred space, he finds only the promise of a new beginning.