After Nightmare Moon was banished, the bat ponies were society's scrapgoats. Despite Celestia's best efforts, they exiled themselves. Now, a thousand years later, they have settled in the Everfree. When supplies start getting low and Timberwolves grow bolder, Night Lily must leave her home and live among the ponies, waiting for the right time to reveal herself and her people.

Rated teen just to be on the safe side.

Nightmare Moon wakes up in a world where everyone walks upright. After being taken in by a group of strangers who are way too trusting, she starts to question her past actions. Meanwhile, in Equestria, King Sombra makes an alliance with the Wendigos.

Takes place before Twilight is an alicorn

Unedited