Yu Lie approached the vicinity of the mountain stronghold.
He glanced at the clear boundary line beneath his feet, suppressed his aura, and quietly stepped inside.
However, as he continued to sneak further into the stronghold, a voice suddenly rang out from the bamboo tower:
"A guest has come from afar, why hide your head and tail?!"
The voice was cold, carrying a hint of impatience from being disturbed.
There was no one else around Yu Lie, no one spying on him, but as soon as he heard the voice from the bamboo tower, he knew it was directed at him.
This made Yu Lie take another look at the boundary line encircling the entire stronghold, thinking to himself:
"Could it be that this boundary line, drawn with talismans, has the ability to detect cultivation levels? Once a high-level Dao Child enters the stronghold, it alerts those inside?"
Yu Lie wasn't wrong.
This boundary line indeed had the function of distinguishing cultivation levels and filtering people.