The Yan Luo Jing is a compilation of the source of all divine techniques found within the Ghost Law, forming a 'Netherworld Scripture'.
The Yan Luo Jing is also known as the Original Vow of Yan Luo, this scripture has no form or shape, and it is an irregular entity formed from the aggregation of ghosts' thoughts, such as greed, anger, ignorance, pride, and doubt.
Though named a scripture, it resembles more the ghostly chant recited orally by the specters in this world.
Xu Qing opened the Hidden and Bright Consciousness, communicated with the Bridge of Heaven and Earth, entered the Divine Scenery, attempting to comprehend the True Profound and understand the text's content.
However, as soon as he touched the Yan Luo Jing, the scripture formed from the collective thoughts of many ghosts instantly transformed into a torrent potent enough to engulf the consciousness of immortals, saints, and gods, rushing towards him!