Mind state : Mind above nature
When Ruruo and Wang were both concentrating on checking through the content of the star immemorial body art, someone else was observing their location with some doubts.
As early as the power of stars landed here, the remnant soul started to observe them.
The scary thing was that the eyes of the remnant soul seemed to contain some galaxy of stars, deep and could penetrate space.
It seemed even Situ couldn't find it, in that case, it explained a fundamental problem.
The remnant soul probably is some scary existence. But that was something that everyone was oblivious to.
It was a remnant soul that stayed in the crystal that Fengxi always has on her.