The protagonist Li Wuhen was originally a modern ancient martial arts master. After traveling to the Tianxuan Realm, he was imprisoned in a forbidden area for hundreds of years by the orthodox sect Tianjian Pavilion because he was carrying the "Nine Nether Demonic Bones". He was tortured by having his bones cut out and his soul refined. When he was about to die, he awakened the [Ten Thousand Demons Return to the Sect System] - using demonic energy as currency, devouring the enemy's cultivation level can be exchanged for demons from all over the world to help the sect. Every time he accepts a disciple, he can also trigger the "increase of demonic luck". He broke free from the shackles, used his broken demon body to break out of the forbidden area, and established the Demon Sect's prison gate in the extreme northern wilderness. He vowed to "rule the sky with demons" and break the rules of ascension monopolized by the righteous.
