Twilight tries a new spell, but fails and lets out a horrible monster into Ponyville, that seeks out her friends and punishes them.
Credit to Artha-Amberose on deviantArt for cover.
It's still work in progress. I will add the rest of the mane6 in next chapters. My first language isn't English, so please point out the mistakes in the comments and I will fix them. Please rate and comment.