"Xuan Tian Ji" tells the story of Lin Mo, a young man with a thunder vein, who accidentally got involved in the secret of the Qingyun Sect's "blood sacrifice" a hundred years ago. He was originally an ordinary boy from the Black Wind Valley. Due to a chase, he met Su Qing, the holder of the spirit pattern. During their escape, the two discovered that there was a mysterious connection between each other's bloodline - the "double pattern integration" of thunder veins and spirit patterns was actually the key to solving a century-old dilemma.
From the life-and-death fight in Black Wind Village, to the guidance of the thunder-patterned stone tablet, to the strange confrontation at Blood Moon Cliff, they were constantly pursued by forces such as Elder Qian, and even encountered supernatural beings such as white-eyed dead men and strange things in paintings. With the in-depth exploration of the "Blood Sacrifice" forbidden technique, the legend of the Thunder Spirit Fox, and the secret code of "Xuantian Ji", Lin Mo gradually understood that the thunder veins in his body were not born, but the natal essence and blood buried in the blood sacrifice master; Su Qing's spirit pattern was closely related to the family mission of guarding the thunder veins.
The blood moon rises, the door to the forbidden land opens, and the truth about the sect's destruction and the defection of the elders a hundred years ago comes to light. Lin Mo and Su Qing must break through their cultivation in the pursuit and conspiracy, uncover the ultimate secret of "two patterns in one", and face the ultimate showdown between blood and fate - should they become vessels for the blood priest, or break the reincarnation and rewrite the ending recorded in "Xuan Tian Ji"?