Okay, so, as the title implies, I'm looking for a story I read one time, and really liked. It was about Celestia learning what was basically a reality altering spell, asking Luna to join her to make the world a better place, Luna declines, Celestia goes insane and starts tormenting her in various way, and is later joined by Discord and Queen Chrysalis in tormenting Luna. I don't remember exactly where it was posted, or where I found it, but it was probably my all time favourite mlp story, so any help would be really appreciated.