The Ruby Phoenix Tournament reaches its exciting conclusion! The sorcerer Hao Jin is nowhere to be found. The heroes' search for the tournament's grand judge takes them across Tian Xia's legendary Flying Mountains and face to face with the Celestial Dragon. They ultimately reach a dark demiplane where a nefarious otherworldly villain is holding Hao Jin captive. In order to rescue the Ruby Phoenix, the heroes must defeat their ultimate rivals and claim the title of tournament champions.

"King of the Mountain" is a Pathfinder adventure for four 18th-level characters. This adventure concludes the Ruby Phoenix Tournament Adventure Path, a three-part monthly campaign in which the players compete in Golarion’s most amazing international fighting tournament. This adventure also includes a gazetteer of exciting demiplanes found across Golarion, inspiring lore about the epic fighting tournaments in other corners of the multiverse, and a mountain of new monsters.