From Emilio, Guding obtained various pieces of information about the Heavenly Demon, though it didn't completely solve his mystery. However, Guding let him go, after making some subtle alterations to his body.
Killing him wouldn't be very significant. As long as the Heavenly Dao Alliance has enough time, they can always cultivate another in the Supreme Realm. As for crippling his cultivation, it wouldn't work either, as he could quickly recover under the loophole of the Heavenly Dao. Therefore, Guding didn't harm him but instead left a subtle method to allow himself to probe into the internal situation of the Heavenly Dao Alliance. Emilio himself was unaware that Guding had tampered with him.
Guding arrived at the battlefield and in less than three minutes, he single-handedly resolved an entire war. His prowess on the battlefield instilled awe in everyone.
