Dear Princess Luna,
It's been a lonely 450 years. I still can't believe that the last letter I wrote to you was over 200 years ago. I feel so ashamed for not making the time to write you more letters. The crown is heavy upon my head as the sole sovereign ruler of Equestria, but I digress.
I've discovered some good news and some bad news about your banishment. The good news is that you will definitely return to me, but the bad news is that it will be another 550 more years until the end of your exile. 1,000 years of banishment seems excessive to me, but I unfortunately cannot fully control the power of the elements of harmony. They did their job, and now all I can do is wait impatiently for your return, though to be honest I'm actually a little scared of the prospect now. Do you hold this against me? Will you come back only worse than before, with a great thirst for vengeance?
It pains me so to write these letters knowing that you cannot reply, but it pains me more to know that you let your jealousy and rage overtake you, turning you into the monster my subjects fear and loathe. I know I should be more forgiving of you, my only sister and family, over these hundreds of years, but your actions against me and Equestria have truly disappointed me and have made me angry. It's strange that I'm only now starting to lash out at you considering your treason, but honestly, this anger and hurt has been building up inside of me for all of these painful 450 years. I hope you can forgive me for saying this, but sometimes I think it may be best that there is only one throne. I've tried to help you Luna, but you have refused my gestures of peace all of those years ago. I hope that when you come back, you will personally apologize to me and the subjects that you have callously hurt.
Celestia