Nightmare Moon's Prophecy · 6:56am Mar 6th, 2018
It's been a month, so I'll post something. I read this theory elsewhere, ICR where but it makes sense to me, so I'll repost it from Episode 1
Legend has it that on the longest day of the thousandth year, the stars will aid in her escape and she will bring about nighttime eternal!
Look at Twilight's Cutie Mark
Remember that more than 1 "her" escaped that night -including Luna
Remember that nobles, especially royalty, often have a poetic but meaningless title or 2.