Celestia, the great wise leader of Equestria has fallen by the horn of dreaded Changleling Queen, however with her last breath, Celestia sealed her hated nemisus's fate by turning them both to stone.

Princess Twilight Sparkle, witnessing the death of her teacher, can't take it in and takes on the role of both the sun and the moon, as insanity sets in.

With the death the the Changeling Queen, the Horde now is running loose, attacking ponies at will. Now, any survivors must band together to live through this apocalypse.