When Twilight goes to confirm her theories on how the Mirror Pool works with clones, it was going to be a quick experiment and nothing more. But in all scientific achievements, there is always a margin for error. And with Twilight no mistake is ever small. Will this one bring only pain and sadness, or perhaps change what we all once thought to be true?

Thank you to The Albinocorn and Zodiacspear for prereading, and thank you to Rated Ponystar for letting me bring your idea to life.