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The Thousand Layered Mountain, one of the Nine Mountains, got its name because of the terrain of overlapping mountains.
In one corner of the Thousand Layered Mountain, there was a Heavenly Grotto, dimly lit and shrouded in gray. The grotto wasn't large, and there were only two True King Heavenly Venerables stationed to guard it.
Not many martial artists entered this Heavenly Grotto, only around a dozen each day, and often, they were martial artists below the Condensation Law Heavenly Venerable level.
This Heavenly Grotto had almost become a training ground for disciples of minor factions within the Thousand Layered Mountain.
The reason there were True King Heavenly Venerables stationed there was due to the fact that a Witch Demon, comparable to a True King Heavenly Venerable, once appeared in this Heavenly Grotto, causing a slaughter that nearly wiped out a minor faction.
That's why True King Heavenly Venerables were arranged to guard it in turns.