Northwest of Ancient Moon City, a thousand miles away.
Here stands a medium-sized mountain range called Thunder Mountain. Thunder Mountain appears extraordinarily calm on usual days, but often under a clear blue sky, sudden lightning and thunder emerge, possibly giving the mountain its name.
Of course, Thunder Mountain is most famous not for these celestial anomalies, but for a special place within the mountains. It's said that a powerful Heavenly Rank expert had once passed away here, and due to practicing an extraordinarily mighty Thunder Attribute Technique, the Thunder King Valley came to be.
Only those who have reached the Heavenly Rank Realm can earn the honorable title of "King." Since the valley within Thunder Mountain is named Thunder King Valley, it might really be the legacy of a Thunder Attribute Heavenly Rank expert.
