The Swallow Thief is one of the seven souls among the three souls and seven spirits. If the Swallow Thief is annihilated, he will die.
Chu Pingshan told Shen Wuming about this set of "Swallow Thief Seal", and Shen Wuming immediately understood it.
[You learned the Yin-Yang School's "Swallow Thief Seal", pondered carefully, and created the better "Seven Spirit Seal\