As the story goes, after the Tong Tian Sect Master had killed eighteen disciples of the Heavenly Dragon Sect, the Qing Tian Tree learned of their strength and sought protection from Wukong.
Wukong brought it into the Posa Greater World, where it took root at the central position of the four great continents within the Posa Greater World, rising to support the sky and making the world more stable. Furthermore, a faint trace of the Power of Creation began to emanate, bringing great benefits to the cultivators of the Posa Greater World.
Wukong had no plans to release the old friends of the Posa Greater World; he decided to wait until he was stronger and had a firm footing before building his own power.