Chapter 915: Chapter 586: Evolved Thunder Spirit, Formed The Underworld

Without the Primordial Spirit, there naturally could be no talk of seizing or dominating, making the latter undoubtedly a moot point.

Whether it was the Ancient Guidance Palace or the Origin Ancient Device, both required first luring away the original soul and spirit, then infusing a Dark Force, and thereafter, depending on the host's Realm and potential, evolving a brand new Dark Immortal Spirit over a varying duration.

This was an inevitable process that even creations by the Three Dark Emperors had to adhere to; it couldn't be altered.

It wasn't that the Three Dark Emperors and the Nine Nether Hound initially wanted it this way, but that they had no choice but to design it this way.

Like the law of conservation of energy, all elements and things must follow the principle of equivalent exchange; no one could be exempt from this rule.