Twilight was the statue yards at Canterlot castle, trying to solve the mystery of the famed hero, Majustica. convinced by Discord's statue, she releases Majustica into the world, only to discover the reason she was placed into stone in the first place: Majustica was formerly the self-corrupted tyrant of Equestia by her own powers and the royal privileges. in a result, she had to be turned to stone by the celestial sisters. having been unintentionally freed by a curious Twilight, Majustica, the Princess of the Scrolls and the unleasher of the Alicorns has returned, this time, she will see to it that the Benevolent Celestial sisters pay for their transgressions and defeats the now current wielders of the Elements: Twilight and the other main 6. (Note, my headcanon changed after seeing a video, and i will change things around.)

Image done by pumpkinhiphop and part of a comic (source shows it.)
rated teen due to fighting, bloodiness (but not gore) and strongly dramatic moments.
based on the forementioned comic. (with added changes and twists).