While exploring the multiverse, Princess Celestia stumbles on the true nature of Twilight Sparkle's existence... and the most ridiculously, hilariously dark timeline imaginable.

Will Twilight's sanity hold together long enough for her to learn what Celestia has discovered? Or will the Darkest Timeline corrupt what was thought to be incorruptible?

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Happy Halloween 2015, everybody!

Cover art is an edit by the always impeccable Swirling Line of one of my very favorite reaction images.