Natures pushed into a corner and soon to lose its balance, the one who loves the enemy finally decides to stop the enemy before it's too late.  As so, a hero is summoned to become the new Gaia of the world that lacks one…

In past days of old, Luna would happily roam with her dear sister

But when she discovered the humans, something caught her eye
Something so powerful, not even she could escape it

In a last ditch effort, Celestia turns to the very race that started the whole thing

This was unexpected. I woke up on a normal day. A boring normal day.

Well, I guess I can't say boring anymore...

This is part of the Pony Earth Verse