The cultivator had delayed for quite some time but finally continued forward.
After him, two more cultivators appeared one after another, both detecting a clear feeling of being spied upon at this place, and after spending some time, they found a monitoring artifact and a stone. They didn't understand the function of the stone, but judging by its position, it should be part of a set with the artifact.
As they ventured deeper into the Secret Realm, they occasionally felt spied upon, each time finding artifacts and corresponding stones. After several occurrences, these cultivators became somewhat numb to the sensation, and some didn't bother to search when they felt it again.