Nygumi. Ampere. Diamond Sparkle.Fablehoof. Sureshot. Cirrus. Descendants of the Mane six. Citizens of the Lunar Republic.
These six ponies are sent back in time. Their mission? Kill Celestia, saving the lives of billions if not trillions.

But alicorns aren't easy to kill, even if you do have the Elements of Harmony as your weapons.

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First Pony fic, please be nice.