History haunts her to this day.
It had started slowly. Luna's words to her had become annoyed, curt. She would question her judgment, where before she simply nodded her agreement.
Had she ever truly agreed? Or had she feared the alternative?
Celestia had ignored the signs. It was all a phase, she told herself. It would blow over soon.
It didn't.
She still hates that fateful night, when Luna finally rebelled. She still hates the jealousy she saw when that monster called Nightmare Moon consumed her sister. She still hates the fear and sorrow she felt when her incantation banished her to the moon.
She still hates herself for not seeing the signs.