Given the South Hong Seven Sons' years of minimal contact with the outside world, it wouldn't be an exaggeration to call them ignorant and isolated.
Even so, several Daozi quickly realized what Yan Chongzhang was referring to by mentioning that mountain.
The mountain had existed for such an impossibly long time, it was likely there even before Hongze ever appeared.
The Ban Shan Sect did not name it, simply calling it "Mountain."
The founding patriarch felt unworthy to name it, as the sect itself had come into existence because of it.
Other forces, to distinguish it from other mountain ranges, casually called it Nameless Mountain.
There were rumors that Immortal Laws were hidden inside Nameless Mountain, and only those of exceptional resolve and talent could comprehend them.
The reason it remained a rumor was that, to this day, the so-called Immortal Laws had not yet appeared.
Others did not suspect the Ban Shan Sect of hoarding secrets.