At that time, Chu Jiang was already so powerful just by carrying the imprint of the Book of Life and Death, whereas now the Wheel King carries the very essence of the Book of Life and Death.
For the underworld, obtaining the heavenly mark is only the first step. Once an ancient entity almost capable of controlling the world, the current underworld has been forgotten by people, mostly existing only in the memories of ordinary people.
This is far from enough; they need to obtain the heavenly mark, possess a true Ghost Immortal, and then start annexing other forces to achieve the glory of ancient times. Therefore, the Ten Palaces of King of Hell have allowed the Wheel King to carry the essence of the Book of Life and Death, showing how much hope they place on this heavenly mark.
