Ghost King Valley was a deep valley formed by the three huge mountains around it and was steeped in dense fog the entire year. The shrubs here were almost 1-2 meters tall and it was covered in brambles everywhere while the mountain rocks were rugged and steep. Just a slight mishap could cause one's foot to slip and make them disappear into the depthless chasm.
The creatures of the valley were so strong that they could contend with a Crossing Tribulation Stage cultivator. As such, the place had become deserted and rarely had any visitors.
Tang Xiu had only visited the outer sections of the Ghost King Valley during his previous visit and left quickly after obtaining the Soul Phantasmagoria Demonic Flower and the Demonic Revival Grass. This was because the strength of the fierce beasts in just the outer sections of the Ghost King Valley was as strong as his, so he didn't dare to enter the depths of the valley.