On the Moon
A beautiful young filly sat almost like a statue he mane flat against her back as she focused on some unseen object her horn at least what was left of it beginning to glow darkly with cyan colored magick, much like how her eyes were colored now. The darkest of red and purple
This filly was none other than Twilight Sparkle the only filly to ever learn under the teachings of the princess of the day Celestia that ruled over Equestria with her younger sister Luna, the princess of the night and the raiser of her 'home' and prison, the moon. She had been sent to the moon just over five hundred years ago and had somehow remained young though she did not feel that way, she just wanted to get off the blasted moon her mind racing with anger and hate at her 'teacher'
Celestia, she would find a way to go home again but she knew it would take time and a lot of magick to move from her prison. Twilight thought to herself, 'Since I gain power every time the moon is raised and lowered by Luna, I could just let that give me the strength I need to get off this blasted rock, but I still need to learn history and more magick if I am to face the 'princess' when I return to Equestria'. The filly started to plot her eyes getting darker and darker over the time as her usual insanity took over again. Spending five hundred years alone could do that to a pony though, the princess probably thought she would become stupid and compliant if she was on the moon long enough. Well if she thought that she would be very wrong, Twilight was getting stronger and smarter, her insanity driving her into the darker arts of Equestrian magicks and darker rituals that would destroy the older Alicorn
Since Luna had been sent to the moon almost a thousand years before there were slight structures built into the surface, an observatory was one of the bigger things and Twilight Sparkle spent most of her time inside because Luna had somehow used her magick to summon objects and books from somewhere, but none of them related to Equestria or anything which would have made them useless if they had not talked about the older magicks that Princess Luna herself knew, they described how to use the beautiful stars to make you stronger, how to build objects out of thin air or stone with just a single thought, it probably took Luna a few hundred years to build the observatory let alone stock it with books on powerful magicks both dark and light.
Twilight was quite impressed and she swore on that moment that she would do her best to use the next five hundred years to learn all that she could and return home to Equestria so that she could get her revenge.