We all know what’s been going on with the Main 6 and Tempest while they were away from Equestria. But, the biggest questions would be: What happened while they were gone? What could the Storm King have done while he took up residence in Equestria?
The Storm King never really died...but being reduced to a broken statue isn't most people's idea of living. The ponies of Equestria could bring him back to life if they wanted to...but only if they can convince him to behave. Good luck with that!
Tempest Shadow has an untold past that nopony really understands. One day, she tells Twilight Sparkle what actually happened on the day she lost her horn and also learns a valuable lesson; that everypony is truly wonderful in their own way...
When the Storm King's statue is restored and revived, the former ruler seeks to travel to the southwest area of the world to confront former demons from the past. In order to do so, he will need assistance...from the least likely group to help.
The Storm King was defeated long before the moment he set foot on Equestrian soil. He just didn't know it yet. Thankfully, one of Equestria's darker secrets can explain it better to him.