To revive the Primordial Demon God, an oceanic amount of power had to be poured into it.
Why had the Devil Ancestor set up the Primordial Demon God Blood God Grand Formation beneath the Human-Demon Battlefield back then to revive the Primordial Demon God?
The fundamental reason was that war never ceased on the Human-Demon Battlefield, and vast numbers of soldiers died in battle every day, every moment.
The blood energy, baleful intent, and resentment released after soldiers from both sides died were all powers the Primordial Demon God loved most.
Only a Human-Demon Battlefield that constantly produced blood energy, baleful intent, resentment, and countless other forms of Negative Energy could, through the accumulation of days and years, revive the Primordial Demon God.
Then, if the Devil Race was also reviving the Primordial Demon God within Sanhe City, they must have arranged a great formation similar to the Primordial Demon God Blood God Grand Formation beneath the Human-Demon Battlefield, one that gathered blood energy, baleful intent, and other Negative Energy from every direction.
If that was truly the case, then the Eastern Expeditionary Army's surprise attacks over these past few days had, in a sense, been supplying power for the Devil Race to revive the Primordial Demon God.
To confirm this, they only needed to go deep underground, sneak beneath Sanhe City, and see whether there was a similar great formation—or channels and veins that gathered Negative Energy from all directions.
After confirming this possibility, Ye Zhen immediately returned to the Eastern Expeditionary Camp and discussed it with Yu Zhongwen once more, telling him all of his discoveries and conjectures.
Very quickly, another difficult problem was placed before Ye Zhen and Yu Zhongwen.
Whom should they send beneath Sanhe City to investigate? That was the question.
First, Divine King Sacred