I am Princess Luna, I am reapeating my life in a way that many modern ponies call a 'Time loop'. My power extends to the power of prophecy and time magic and while this has aided me for many years I cannot break this cruel cycle of failure and rebirth.
My sister and I save the land from the tyranny of Discord, only to succumb to him a thousand years later, and if not him, then to the myriad of creatures we had thought banished or defeated a millinea prior.
Celestia and I are the only ones that can weild the Elements of Harmony, only we can defend Equestria.
And yet we fail...
Did you truly think it was mere jealousy that drove me to become Nightmare Moon?
Did you find it strange that the elements of harmony would find new bearers when several divine creatures would escape their confines in only a few short years?
I have quite a lot of time on my hooves you see, I may as well make use of it.
Princess Luna is in a time loop, it is a fact of nature. She can not escape it any more than a mayfly can cheat death. This is what transpires as a result. Witness a thousand years of Equestrian history, of Discord's first defeat right up to a Princess of the night trying to find the right way to save the world countless times over.
Enjoy.
If you have an idea for the loops, feel free to submit it Here