The spell trapping Nightmare Moon within the orbital satellite is tampered with, pushing her release past a thousand years into a time where alicorns are myth, technology has somewhat stagnated, and nobody knows who she is.
My very first (self-published) book can be found on Amazon Kindle for 5 or 12 paperback! If you love dragons, give it a look! https://www.amazon.com/dp/B0CSM7QQ2M