Years ago, Ren Feifan practiced the Heaven-Swallowing Technique to prevent his soul from being taken over by Demon Lord Extinguishing Heaven. Later on, the Demon Lord swore not to seize his soul, and Ren Feifan abandoned the martial arts cultivation.
Xu Shihan's grandfather once told him, "The Heaven-Swallowing Technique is a method to devour souls. It cannot kill, nor can it make you strong, but once mastered, it can devour the souls and spirits within the body, absorbing their cultivation and martial arts!
For ordinary people, this might be a negligible cultivation technique, because the incident of a strong soul taking over the body of a cultivator is extremely rare in the Hidden Gate. However, for you, it might be a huge opportunity.
Once you understand all the words within, the Heaven-Swallowing Technique will naturally be yours. This might be a lengthy process or happen in a single thought; it depends on your understanding of the Heaven-Swallowing Technique."
