Twilight Sparkle, just like every other pony, thought King Sombra was over and dealt with, but she couldn't be more wrong. He returns, and plans to make Twilight his queen so he can take over Tartarus, and then, Equestria. As Twilight and her friends struggle to find a way to save Equestria and Twilight herself, buried secrets surface and hidden pasts are revealed.
Can Twilight be saved in time, or will her sanity break?