These are Taiqing runes.
Though their strength is presently insufficient to purge the Heart-Locking Gu, suppressing it is a simple matter.
The effect of the Taiqing Heart Sutra is remarkably potent; the moment the Taiqing runes condense, the mystical Taiqing power transforms into thin cyan threads that travel straight to Li Zhiming's heart. They firmly bind the half-hatched body of the gu worm, rendering it motionless and plunging it into a deep slumber.
Chapter 66