I don't think there was ever really to be a "Destruction" of luna, I think that was just part of the "Evil Plot" that obviously failed. Cause the guy that wanted to destroy it was interrupted by the blue wisp and everyone followed the wisp away from luna and into Jehlom thus leading to the event where they were trying to get the dragon to the water to "Weaken" it and then when we actually started getting some dmg in on it it vanished and everyone was just left wondering what the hell just happen. There never has been a closing to that story line unless the Sea dragon thing with the scale and oil was it.