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Imagine a world in which Princess Celestia failed to defeat her sister. Imagine a world where a sinister reflection of Princess Luna stands victorious, and Equestria lies in darkness. This is the realm of shadow, a parallel world, a separate dimension from the Equestria we know and love.
On a certain Nightmare Night, when Ponyville is full of celebration, a bridge to this realm is opened, and the shadows set their sights on the world of light.