If Chen Mo had happened to be here and seen the small recess and the etched patterns, he would definitely have recognized them as energy circuits. The entire building likely had an array embedded within it.
The small recess was actually a place meant to hold something—a Spirit Stone. Any cultivator of immortality would have recognized it at a glance.
Unfortunately, neither Qian Ying nor Zhou Zixing was a cultivator of immortality. They were merely Martial Artists, so neither could tell what was supposed to be placed there.
Fortunately, after hearing Zhou Zixing's description, Qian Ying remembered something. That was why he had Zhou Zixing go over and test it.
Qian Ying recalled a time when he had been performing a mission and encountered a place similar to a Barrier. It had contained a similar recess, with a white stone embedded within it.
Although they had not known what that stone was for at the time, opening the Barrier had taken immense effort. In the end, the Barrier absorbed all the Xiantian power of a Xiantian Master from their team before it finally opened.
Qian Ying's vague recollection had been this nearly forgotten memory, which was only now slowly returning to him. The memory was simply too old; too much time had passed, and much of it had faded.
However, after Qian Ying explained it, he discovered that Zhou Zixing was just standing there instead of doing as instructed. He stood behind the building, staring blankly at the recess. Naturally, Qian Ying could not see the recess from where he stood. He had merely judged from Zhou Zixing's expression and his distance from the back of the building.
Seeing Zhou Zixing like this, Qian Ying frowned. This fellow was being so uncooperative and refusing to follow his orders. Was he