After only a few dozen more steps into the cave, the scene abruptly changed.
The damp tunnel vanished, replaced by a passage boxed in on all four sides by pitch-black stone walls.
With every step they took, an echo drifted back from the depths of the passage a few breaths later.
The echoes were even clearer than the footsteps themselves.
Not just footsteps—even slightly uneven breathing could be heard.
It belonged to Marquis of Purple Robes.
"Echo Wall," Lamborghini muttered.
An Echo Wall was a highly unusual acoustic structure found only in sealed, elongated cave spaces. It either meant the passage was a dead end, or that some other arrangement had been made within.
For instance, certain horn-shaped terrains, perhaps even involving formations.
Or perhaps both at once.
The place where Zen Master Hui'an had passed into meditation was at the exit of this passage, sealing it shut tight.
Qin He looked at the stone walls on either side. Their edges were clearly defined, yet they looked as though they had been coated in paste. He reached out to touch one, then flicked it.
It felt exceedingly smooth, and a powerful rebounding force shot back through his fingertips.
It was neither metal nor wood, yet the sound was like striking a thick iron plate, ringing with the clang of metal.
Qin He's Physical Body Attains Sainthood; he was long since no longer what he had once been. Any metal in his hand would turn to powder with even the lightest flick.
Yet this flick of his left only several shallow cracks on the surface.
Its physical defenses were downright monstrous. When magical power struck it, it could scarcely seep in; most of it transformed into force and rebounded back.
Qin He had seen this sort of thing before—in the Eastern