AHHHHHHH. Someone please help me. I can't remember the name of a twilestia fic I want to re-read. It's about Twilight discovering that Celestia used her to turn Nightmare Moon back to normal. And when Twilight finished the Starswirl spell it killed her which Celestia said it wasn't supposed to and Celestia brought Twilight back as an alicorn because Celestia didn't want to lose Twilight because she loved her.

If ANYONE knows the name of that story please tell me.