The so-called "demon essence" refers to the unformed demon core.
Celestial demons are born at the ninth rank and possess a demon core, but ordinary demons, after being "infected" by spiritual energy, need to undergo a long and arduous evolutionary process to acquire a demon core.
During this process, some demons are exceptionally gifted, perhaps even possessing the foundation for forming a demon core—the demon essence—from the moment they are infected, making their path to advancement much smoother. Of course, many demons don't finally develop a demon essence until the late seventh rank.
For example, the fox demon Zhou Ang killed earlier was already at the eighth rank, but its demon essence didn't leave its body after death.
Now, Zhou Ang has more knowledge than before, so afte
