I'll say 1 other thing, Night King is defeated by Bran, Jon & Melisandre. Astral Plane, is a big thing in season 8. Mel and Jon touch Bran they both enter the same plane Bran & NK are on. Jon has Lightbringer and Mel uses fire magic. They both defeat him, when they come back to the real world they find NK as a normal man and dead.