C76 Blazing Sun Sword
The secret chamber might have been adjacent to an underground river, which could explain why the walls were covered with moss in many places. However, there was one area, the size of a doorway, that was conspicuously bare, devoid of any moss. This anomaly caught his attention, prompting Yun Buhui to push against the moss-free wall.
With a faint creak, the wall gave way with little resistance