C915 Death Qi Explosion

Feng Yimo only needed to use the Yin-yang Spell to completely absorb the grey gas that was emitting death energy. The key was to find the source of the death energy and completely remove it from the root. He could not let it recur. More importantly, he did not want to use the Yin-yang Spell in front of Shaan Ningqing, Liang Dong, and the others. Besides, there was also that unknown grey insect