At the very center of the island, there are five mountains. Ji Nanhong informed Chen Guan that locals call these five mountains the Celestial Ladder Mountain.
The ladder to heaven shows the first without showing the second, shows the second without showing the third. To see the highest Fifth Peak, one must ascend to the summit of the Fourth Peak.
If you seek the eternal heavens, you must climb the ladder to heaven. The Great Black Celestial Demon God Statue is atop the Fifth Peak of Celestial Ladder Mountain.
The previous four mountains are also inhabited by various Secret Spirits. However, they seem to have been recently cleaned out, so when Chen Guan and Ji Nanhong arrived, they did not encounter many Secret Spirits. Any wandering Secret Spirits were swiftly slain by Ji Nanhong, who was not in the mood to waste time.
