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All the apostles are pigeons given a human form by the Intoners will, and transform back before fighting One.
Mikhail sacrifices himself to heavily damage One's Dragon, Gabriel. Zero kill the Dragon and One, before she is stabbed in the back by One's IDENTICAL TWIN BROTHER, whose costume, stained with blood, looks exactly like Manah's from Drakengard 1.
One's brother goes a bit...peculiar, and walks off laughing. A flock of pigeons flock near Zero's body, then a mysterious black-haired woman appears (which commenters are saying is "Six"?), walks over Zero's body, and vanishes in a flurry of pigeons.
And that's Ending A.