Angel remembered the man possessed by the Void Unicorn Whale saying to him:
"Don't confront it directly; find a way to enter the Hidden Meeting Room... I'll be waiting for you there."
The "it" referred to by the man was the Otherworldly Infant Spirit, the formidable enemy that Angel and his companions would face shortly after leaving the Hall of Wisdom.
However, when Angel recalled this sentence, the highlight wasn't the Otherworldly Infant Spirit but rather the "Hidden Meeting Room."
There's no doubt that the Hidden Meeting Room is in the relic site, namely the Qingkong Poetry Room. Yet, on the layout provided by the Wise Sovereign, Angel didn't see a Hidden Meeting Room.
This implies that the Wise Sovereign's speculation is correct, and indeed there exists a hidden chamber in the Qingkong Poetry Room?
"Hey, what's with the serious look on your face?" Dox suddenly spoke up, looking at Angel.
