Twilight goes back in time to find a 'Legend of Zelda' theme like world that follows a few months after the first Hearth's Warmth. History is not what it seems to be as the tribes still despise each other.
Equestria has been defeated. Nightmare Moon has won, and Princess Celestia has been banished to the moon. The ponies that fought for Princess Celestia now find themselves left with a choice: swear fealty to the Princess of the Night, or die.
When a black and red alicorn appears in the Everfree Forest, Twilight and the others are sent to investigate. Unfortunately, this visitor is an incomprehensible mess and quickly drives the girls insane.
Having to wait for the now-healthy twins to be discharged from the hospital has made Pinkie... bored. The adminstration isn't going to like her when she’s bored...