[Alas, subscriptions are dismal; I ask friends who are able to subscribe to give some support.]
It was said that when the Great Sun Tathagata returned to the Esoteric Sect, he summoned the sect's masters to challenge Water Curtain Cave.
However, the gates of Water Curtain Cave were tightly closed, and the Myriad Immortals Formation had been activated. No matter how much they were cursed at, not a single demon emerged, nor was a single word spoken in reply. Now, Water Curtain Cave was the leader of the Demon Tribe, and a defeat there was tantamount to the defeat of the entire Demon Tribe. Thus, in Wukong's absence, it was best to merely defend their stronghold.