If a Twelfth-Order Late Stage Primal Fiend were controlling the Heavenly Devil Formation, it could turn rot into wonder and push the formation's power past its limits.
Because their understanding of heaven and earth differed, and the strength of their divine souls differed as well, when a higher realm controlled a lower-realm formation, they would naturally correct the flaws within the array and allow its power to break through its original framework.
Qi Moyu and the others were only Twelfth-Order Mid Stage, incapable of making the Heavenly Devil Formation break its limits, and they had never imagined that the Heavenly Devil Formation would be broken open in such a way.
Boom!
A heaven-shaking roar erupted within the Heavenly Devil Formation. The attacks unleashed by the other eleven Primal Fiends trembled inside the formation, but they failed to injure Chen Fei.
After Chen Fei and the Night Demon War Soldier killed the Primal Fiend before them, they took advantage of the damage to the Heavenly Devil Formation and the resulting flaw in the array to follow the cracks in the Heavenly Devil Formation and appear directly before another Primal Fiend.
Why had Chen Fei entered the formation just now instead of slashing at the Heavenly Devil Formation from outside?
Because although the interior of a formation was stronger, once damage appeared, the operation of the entire formation would also develop even greater problems—just like now.
These Primal Fiends had formed the Heavenly Devil Formation, and though the power gathered together had increased greatly, they had likewise bound themselves inside the Heavenly Devil Formation. All their movements were restricted by it.
Seeing Chen Fei and the Night Demon War Soldier appear before him, the Primal Fiend's expression filled with terror. He wanted to retreat, but the trembling of the Heavenly Devil Formation