Qin Heng forged the Chaotic Clock, not on Earth, but chose to do so within the Secret Realm of Time-Space Seal.
In the Secret Realm of Time-Space Seal, he is the master of the Heavenly Dao, even though he only controls the projection of the Central Heavenly Domain's Heavenly Dao, it still allows him to wield the power of the Returning to Empty stage!
With such power, forging an imitation of the Chaotic Clock, Qin Heng could even create a Pseudo-Immortal Artifact!
Any true Immortal Artifact is equivalent to a vast universe, containing infinite Dao and myriad Laws, and without becoming a True Immortal, it is impossible to forge one!
Pseudo-Immortal Artifacts are the pinnacle that can be forged in the human realm!
In many civilizations and worlds, such treasures close to true Immortal Artifacts are revered as supreme divine artifacts, sacred artifacts of civilization, kings of artifacts!
