One Billion Levels of Qi Training: the Return of the Demon King

Ren Pinhan accidentally traveled through time, and his soul penetrated the demonic ancestor who was attacking the Tianzun realm. Unexpectedly, there was a fatal error in the system. The eleventh level of Tianzun cultivation in the novice gift package was completely compressed into the realm of Qi refining. Thus, the unique Qi refining in the whole world was born - billion layers! "What does it mean to blow up Tianzun with one punch during the Qi refining period?"