An Angel of Vengeance

What if Loki was really Gabriel an archangel of the Lord? The Avengers and Thor have no knowledge of Loki's true nature, but that is soon going to change. Because the Apocalypse is finally coming since Lilith broke the 66 seals and freed Lucifer. How will Loki deal with facing his past as Gabriel, stopping his evil brother, and finally admitting to the Avengers what he really is?