Return Tens of Millions and Become a Teacher Invincible in the Heavens

Qin Yu traveled to the world of Zhetian and received tens of millions of signatures to return critical hits to the system. He teaches his disciples twenty years of skill, triggers a thousand times critical strike and returns it, and obtains ten thousand years of skill. Give the disciple a foundation-building pill, which triggers a thousand-fold critical hit and returns it, and gets an elixir. You gave your disciple Nuwa's Heart Sutra Kung Fu and the original Golden Seal Kung Fu, triggering a critical strike return of ten thousand times, and obtained the Mythical Great Luo Kung Fu technique.