There's an immortal Sutra inside

Soul searching was actually not difficult. It was very easy to do.

The key was that many powerful great cosmoses in universe ocean would set restrictions in the souls of their race.

Anyone who knew some secrets, and their cultivation was not too weak, would set up a restriction. This was to prevent others from soul searching and revealing the secrets.

If a soul was forcefully searched, the restriction would explode and be destroyed along with the soul. Therefore, it was impossible to search the soul of such a person.

The evil Yin great cosmos was the fifth-ranked great cosmos in the underworld. Needless to say, the experts of this great cosmos must have set up restrictions in their souls.

The night rose could even search the soul and obtain some secrets. It was really amazing.