The Twelve Heavenly Gods and Demons Array was taught by Wu Tian.
Since he had promised the Ancestral Dragon that he would help him return through reincarnation, Wu Tian naturally could not stand by and watch him become hopelessly obsessed with the "elixir of immortality," only to be deceived by the alchemist Xu Fu and fail at the final step.
So he might as well see it through to the end!
He also thought highly of First Emperor Ying Zheng. Though some of what he had done was imperfect, the benefits had absolutely outweighed the harm. After Duke of Zhou Dan, he had once again rewritten the underlying code of the Human Clan...
After First Emperor Ying Zheng, the notion of unification became deeply rooted in people's hearts. Any regime seeking to remain content in some remote corner would inevitably bear the stigma of condemnation.
Only by achieving unification
could one truly gain the greater righteousness of the Human Clan!
Moreover, as Bai Qi had said, First Emperor Ying Zheng's emergence signified a return of fortune to the Witch Clan. The Witch Clan had failed when competing for the Human Emperor last time, but this time, they had finally succeeded...
Wu Tian treated the Human Clan well.
But he was, after all, a member of the Witch Clan!
Now that the Witch Clan's fortune was flourishing, as an Ancestral Witch of the Witch Clan, he naturally had to involve himself. It was not a matter of favoritism, but simply what ought to be done.
He had helped Emperor Xuanyuan last time.
This time, he would naturally help First Emperor Ying Zheng!
Besides...
Wu Tian had other calculations in mind.
If First Emperor could use a weakened version of the Twelve Heavenly Gods and Demons Array to break through his own