It consumed some of Qingfeng Li's Golden Flames for him to help Tiandie Mu drive out the death energy which was extremely hard to get rid of. Fortunately, Qingfeng Li had reached the half-immortal realm otherwise he wouldn't have been able to accomplish it if he had been at the saint realm.
Then he helped Tu Ba drive out the death energy from his body.
They had received serious injuries from Yin-Yang Sky Roc. If they had been slow in fleeing, they would have died.
With sweat on his forehead, Qingfeng Li found this situation quite tricky since it was the first time that he met grey death energy.
Although he had encountered people from Sky Corpse Sect, they cultivated corpse energy instead of death energy. After all, the two energies were totally different things.
Corpse energy came from zombies who still had their own awareness; however, death energy had no awareness at all since it was totally controlled by death.
Swoosh!