The Federation fleet try to destroy the Kukai base as it appears to be the source of the Song, but Wilhelm—who has been secretly observing events—arrives with a private fleet that destroys the Gnosis and protects the base. KOS-MOS then uses an advanced weapon to detect the Song's source in a cloaked spaceship. Boarding the spaceship, the group rescue MOMO and fight Albedo, but are stopped by a blue-cloaked man who allows Albedo to escape with a piece of data extracted from MOMO that could grant access to Miltia. Albedo then summons Proto Merkebah, a research ship created by Mizrahi to summon U-DO, and destroys the Federation fleet before aiming Proto Merkebah's weapons at Second Miltia's capital. The blue-cloaked man—revealed to be a resurrected Virgil—observes events before being summoned away. Shion's group infiltrates Proto Markebah and destroys its core while Albedo flees. Escaping Proto Merkebah as it self-destructs, KOS-MOS shields the damaged "Elsa" as it enters Second Miltia's atmosphere.