"It is indeed very well hidden!"
The trio walked upstream along the river and entered a cave. The river was gushing forward from that cave; it actually looked like a fountain. If one did not pay attention, who would have noticed it?
Furthermore, heading into the cave for tens of kilometers, they still found nothing. There wasn't a sliver of light inside, and divine senses could not be used; normal people would have left the cave early on already, right?
It was actually easy for Poison Spirit to find this entrance. He had followed the tracks left behind by the young masters and young mistresses that had entered. Poison Spirit's tracking abilities were legendary. No detail too small could escape from his eyes while that bunch of young masters and young mistresses would definitely have left some traces behind.
"It is just up ahead."