Xu Hei, having the experience of killing the Nightmare Demon Lord, knew that the protectors of the Sea God Sect wouldn't die so easily. They had their own unique life sources.

The heart veins, the sea of consciousness in the forehead, and even the Elemental Infant were not their life sources! Even if their physical bodies were completely destroyed and their Elemental Infant annihilated, they wouldn't perish!

These left-path demons were quite different from ordinary cultivators.

This realization made Xu Hei aware that Xu Qingzhi wasn't dead, and perhaps the Devouring Demon Lord wasn't either!