A year has passed since the Tyrant Ruler of the Crystal Empire Sombra was defeated. Many things happened in that year but the highlight of all was Twilights Princess Coronation. But ever since the adventures in the Crystal Empire Twilight wants answers, about some Questions like 'Why did the Crystal Empire return?', her Mentor Princess Celestia said that Sombra put a curse on it when he was banished by her and Princess Luna.
But not even both Princesses were able to undo the curse a thousand years ago. But it suddenly came back? Twilight found that suspicious, if Sombra made the curse to last only a thousand years why did he also return wasn't he banished by the two Princesses? Discord couldn't undo the curse and bring back Sombra either, because at the time the Crystal Empire came back he was turned to stone by the Elements of Harmony.
So who or what was responsible for undoing the curse and bringing the Crystal Empire and Sombra back?