Twilight Sparkle and a Pinch of Chaos
“Twilight Sparkle was minding her own business studying in the library when Discord showed up to flip her world upside down. And there are Twilights to spare, he assures her, in a world not totally unlike but far from her own, where girls like her walk on hooves instead of feet…and where her other self will soon be the only one living after Discord is finished with her.”