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Save the uncorrupted angels in Eden Prime.

Chapter 11: Bastion's Fall has a number of regular, white angels that you will have to protect shortly after meeting Abaddon at the start of the chapter. They will be attacked by purple corrupted angels. This should be fairly easy to do on Easy or Normal, especially if you're replaying the chapter after beating the game once. Use Strife's shadow clone ability to get extra help. Playing in co-op can make this much easier as well.