The Ancient Emperor himself did not know that absorbing 99% of Wu Yu's Primordial Spirit would be of such great help to the Heaven Devouring Avatar.

But while the foreign partial immortal spirit of the Ancient Emperor was mostly in control, he was unable to fully sense the presence of the avatar. 

Wu Yu's Heaven Devouring Avatar was like an arm of the Ancient Emperor. The Ancient Emperor could not control Wu Yu's Heaven Devouring Avatar, but because he existed, the stronger he grew, the less likely Wu Yu was to lose control and descend into madness.

This was perhaps the only good news today. At least up till now, Wu Yu had established full control over his body, and perhaps even had some room for devouring.

Besides, each time the Ancient Emperor strengthened Wu Yu's body, Wu Yu could feel it.

As the Ancient Emperor was an immortal with an immortal spirit, he naturally could do this, having a more profound understanding of dao compared to Wu Yu. Therefore, when he first gained control, there would be a period of time where he had successive breakthroughs. Although Wu Yu did not know how much...