Alien Technology. "All right, I guessed as much." Lu Zheng shrugged, showing that he had thought of it long ago.
There were soul-splitting techniques here as well; Nightfall King, the first BOSS he had fought, knew one.
But for Extraordinary beings with ambitions, the drawbacks of soul-splitting techniques outweighed the benefits. Forget having no hope of ascension—even upon reaching a certain realm, the flaws in one's true spirit caused by splitting the soul would prevent any further progress.
Thus, those who knew soul-splitting techniques were instead mostly mediocre cultivators. Very few truly powerful figures cultivated such methods.
Of course, for even more powerful beings, whose true spirits were stable and profound, the drawbacks of soul-splitting techniques certainly would not affect them.
Thus, they could instead split off souls from time to time to descend into the mortal world and walk among humanity.
"But even if they are merely wisps of the heavenly demons' divided souls, they remain exceedingly powerful to us. Their mysteries are beyond our understanding, so while we can destroy their bodies, we still cannot stop their true spirits from returning," Si Lingxi said.
"If your strength isn't sufficient, of course you can't stop them," Lu Zheng said. "Forget you—even Erlang Shen thousands of years ago failed to stop those heavenly demons' true spirits from returning, didn't he?"
Si Lingxi nodded and no longer dwelled on it.
An elementary school student naturally could not understand calculus.
This was a dimensionality-reduction strike. It was normal that she could not understand it; once she ascended to university and continued studying, she would naturally come to understand it bit by bit.
Lu Zheng and the others were discussing a subject as unfathomably profound as heavenly demons from the Upper Realm, so Yang Caiyi and the others naturally could not join in.