Even desiring the lightning spirit, Mou Tianchi wouldn't rush over and fight over it with Ning Cheng at this moment. In fact, what cultivators fear most is lightning attacks. Cultivation itself is a defiance of the heavens, and lightning attacks particularly suppress the Dao Rhyme comprehended by cultivators, and the attacks are even more potent.
This is also why among the exotic spiritual roots, the lightning spiritual root is the strongest but also the most difficult to cultivate.
Ning Cheng happens to possess a lightning spiritual root; he is one of the very few cultivators who does not fear lightning attacks. Of course, this fearlessness is predicated on the attacks not exceeding his own strength. Once the strength of the lightning attacks far surpasses his own, even with a lightning spiritual root, he would be blasted into nothingness.
This lightning pit, though powerful, has not exceeded Ning Cheng's endurance threshold.