In the wilderness and forests of the mortal realm, wild beasts were plenty. 

Weaker wild beasts were food for the stronger wild beasts. 

Herbivorous animals were food for the carnivorous animals. 

Herbivores fed on grass, and grass grew with the light from the sun and nourishment of dew. 

When humans were added into the picture, they feasted on wild beasts and stood at the top of the food chain. 

This was the law of this realm and every single other realm.

The replacement of the old and survival were basic instincts. 

For survival, one had to consume. 

Martial cultivators might seem to have escaped from this cycle, but they actually had not. 

And now, Wu Yu had a better understanding of his Heaven Devouring Avatar. 

It was just like a small beast that had to consume to survive. If he wanted to grow stronger, he had to devour. This was no good or evil in this, only the law of the realm. 

The great Crimson Blood Roc Demon had an imposing presence. When facing seven other demon immortals, he was domineering and would rather die than surrender. However, under the relentless barrage of 10,000 Levels of Hell and 8,000 Sky Palaces, Shattered Rebirth from Wu Yu's...