Twilight Sparkle has always been Princess Celestia's perfect student. A model of good behavior, of friendship, and most importantly, raw magical skill.
But what if that magical skill wasn't accidental?
What if Twilight was just a weapon?
And what happens if she finds out?
A very, very special thanks to Ralastas (http://www.fimfiction.net/user/Ralastas) for assisting me in this and writing Twilight's final letter.