Chapter 684: Sterl’s Tool?

Immediately after, the massive, dragon-headed humanoid monster's body erupted with a surging layer of gray flames.

These flames were none other than the bizarre, corrosive gray energy that had been present earlier!

With these flames enhancing its form, the creature now appeared as though it had emerged from the ancient past, like a Cataclysmic Behemoth, possessing the power to annihilate everything in its path.

Below, Will of Hell could feel the terrifying aura emanating from this creature, and a shiver ran through its being. It almost froze up from fear.

Just the sheer pressure from its aura made it feel helpless to resist. If these invaders had released such a creature from the beginning, Hell would likely have already fallen.

Of course, the power of the fused twelve mother creatures was overwhelming. Without the Pitch-Black Prison enclosing everything, the disturbance might have reached the main world by now.