During the middle of the Changeling crisis, the mane 6 find the elements of Harmony and use them on the Changelings.

But things don't go as planned. With Celestia and Luna helpless, the mane 6 need to find the other 5 spirits of the Equestria to help defeat the Queen.

But it's going to be hard to get all of the spirit's help, especially if one you need you trapped in stone, and another is unreachable.