Indeed, when Ye Han entered the spatial passage to the fourth layer, the Purple Cauldron in his Divine Sense Sea had reacted intensely.
Clearly, there was a treasure in the fourth layer that greatly interested the Purple Cauldron...
But Ye Han had sensed that treasure moving, and he feared that whatever carried it might also sense the Purple Cauldron's aura.
So he had used his divine sense to restrain the Purple Cauldron in his Divine Sense Sea, preventing it from releasing its aura or sensing the treasure's location in the fourth layer, lest it draw the other party over.
Now the Primordial Ancient Beast had been imprisoned inside the cube, but he still had not figured out exactly what was going on.
Once he entered the fifth layer, however, he would certainly be unable to turn back. So he released the restraint on the Purple Cauldron's sensing ability to see exactly where the treasure was.
Yet the aura that had so excited the Purple Cauldron had actually vanished...
But on closer thought, he had previously sensed that treasure moving, and the Primordial Ancient Beast should have been the only terrifying creature in the entire fourth layer.
The treasure that interested the Purple Cauldron must have been on this Primordial Ancient Beast.
And the Primordial Ancient Beast had been sealed inside the hexagonal Metal Block, which he had placed in his Storage Bag.
The Purple Cauldron could not sense treasures on a different spatial plane.
With that thought, Ye Han tapped his Storage Bag, and the Metal Block sealing the Primordial Ancient Beast reappeared in his hand.
The instant the Metal Block appeared, the Purple Cauldron in his Divine Sense Sea trembled violently, quivering with eagerness. Rings of purple runes rippled across it. It actually wanted to devour the Metal Block...