To enter the second layer, one had to be either the Sect Master or a Grand Elder, and one's cultivation must have reached the Nascent Soul Stage.
If one's cultivation was insufficient, even a Sect Master could not enter. Such a restriction was primarily put in place to protect the sect's heritage from being abused.
No Nascent Soul cultivator had appeared in the sect for three thousand years, which meant no one had stepped foot into the second layer for three thousand years. Ning Chen wondered if there were still any good items left inside.
Chapter 198