The appearance of Du Ling Grass in Burial Soul Valley took Xuanyuan Wuji and Mo Shang by surprise. After all, Du Ling Grass typically grows in the Cave of Ten Thousand Ghosts, which provides the necessary temperature for its growth. Du Ling Grass is quite precious, and its survival environment is demanding, suitable only for the Cave of Ten Thousand Ghosts. Yet Mo Shang recently discovered Du Ling Grass on Cloud Mist Mountain in Burial Soul Valley, implying either a significant climate change in Burial Soul Valley or a mutation of Du Ling Grass.
Regardless of which conclusion, both are hard to believe for Xuanyuan Wuji and Mo Shang. If Burial Soul Valley indeed had significant changes, it would have been noticed long ago, not just now. Therefore, the first possibility is quickly dismissed.
