This isn't very ethical, but if Old Tang did it, then it's still rather normal.
Chen Mumu returned to the mountain peak, glanced at Old Tang sitting on a rocking chair giving the highest instructions to the Heavenly Master Sect disciples beside him, and sighed helplessly.
After giving a few words of advice to her family's elders, she turned to leave.
"Where are you going, Pavilion Master?" an elder asked.
"This place is sufficient with you all here. I'm going to check the forbidden area," Chen Mumu said.
Upon hearing the words "forbidden area," the elder immediately stopped speaking and, along with the other elders, respectfully sent off the Pavilion Master.
The forbidden area isn't the underground palace in Dongqi but another location that has existed in the Sword Pavilion of Jing State for a long time.
The reason it's a forbidden area must be because there's a secret inside.