Mirror of Zhoutian: "I was forged by an Immortal, not some ghost or deity of the Netherworld."
After a brief pause, it added, "Little brother, if you want to condense the Nine Heavens Mysterious Female Primordial Spirit, Walking in the Underworld is unavoidable. Whether it proves to be a blessing or a curse depends entirely on your own means.
However, since you cultivate the Three Thousand Dao Techniques, using them as your foundation should give you some advantage when walking in the Underworld."
Chapter 315