Twilight Sparkle's new duties as a Princess of Equestria are not limited to paperwork and speeches. Also of importance is discovering what once was, so that what will be is not lost to the same mistakes. Deep within Canterlot Castle rests an item of great power, capable of 'reliving' the memories of those who have gone before. Celestia takes Twilight on a journey of the mind to see what happened those many years ago, when sister fought sister and the world suffered, the narrative being explored through a very distinct perspective. Can Twilight step up to the task, and face the darkness as readily as she does the light?

Note: AU tag applies in light of S4's premiere, as we now know the epic battle of light vs. dark was a 3 minute affair.