This was actually a formation called "Commanding Mountains and Rivers Formation", and it concealed this particular valley while drawing upon the Demonic Qi of the mountain below, which served as the formation’s roots. Like any other ordinary formation, this one also had eight passages—also known as doors or entrances—which formed its foundation. They were categorized into three fortuitous passages of "preamble", "leisure", and "growth"; three misfortunate passages of "death", "fear", and "injury"; and two remaining neutral passages of "mundanity" and "terrain".
If someone who had entered the formation was able to identify the precise locations for each of these eight passages, they’d be able to use predictions and calculations to decipher the formation’s pattern and rotations. With this, they would be able to avoid any misfortunate passages in advance and roam freely within the formation without being harmed.
