Zatiel woke up after a week and immediately used his Mind Force to ease the pain that still lingered.
He noticed the respectful glare in Ancestral Root's eyes, but his mind was somewhere else.
'I am an ancient monster who has experienced billions of years of carnage and struggles. My willpower is second to none in the Prima Universe, and I have a True Will that helps me endure any form of pain, but this test almost defeated me. How did that man complete Endless Hell?'
The True Will Path of Power was something he created with the help of the most extraordinary minds of the universe and unlimited resources at his disposal.
Zatiel did not believe The Sage could have something like the golden humanoid helping him, so he did not understand how that man endured a year in the tenth level of Endless Hell.
The greater The Sage's mysteries became, the stronger the Neo-Demon's killing intent grew.
"Now comes the Test of Endurance named Myriad Demonic Heavens. A true Champion can face all the enemies on his path, no matter how many they are. He would fight until every ounce of strength left his body and then kept fighting. The longer you last, the greater your completion percentage will be. Let me know when you can start."
Ancestral Root's words drew Zatiel's attention, stopping his train of thought about The Sage.
The Neo-Demon rose to the air and released his All-Devouring Domain before adopting a meditative position. He began to devour the energy in the surroundings while making sure to push his soul, energy pool, and body to their peak.
Zatiel could have used the time to increase his cultivation as well, but that would have been counterproductive. The higher his Rank, the more powerful his enemies would become.
After twenty hours, the Neo-Demon reached his peak and signaled the Artifact Spirit to begin the test.
Ancestral Root rose his arms, and instantly dark storm clouds filled the sky.
The clouds were not normal since they hindered the detection powers of a life form's consciousness, and even the Rebirth Eye's visual field was affected.
Soon, line after line of demons began to occupy the clouds. The ones visible for Zatiel showed a chaotic and crazed nature that went beyond what normal inhabitants of the Abyss would display.
A power affected their souls, making them behave like mindless killing machines despite their Rank.
The ones at the bottom were Rank 4 life forms at the First Origin Cycle, but the demons became stronger the higher they were positioned.
Zatiel's eyes narrowed when he felt a force cut his connection with the natural energy once the demons appeared.
This hindrance would force the Challenger to keep a close eye on his energy reserves as he fought the demons, but that wasn't Zatiel's case.
'I need to save my Soul Origin and Astral Origin for the demons in the last heaven. I can replenish all my other forms of energy with the help of the All-Devouring Domain.' A battle strategy formed in Zatiel's mind in a second.
The eighty-one bone daggers emerged from the Dream Dimension and began to revolve around the Neo-Demon, while the bone sword appeared in his right hand.
Seeing that Zatiel finished his preparation, Ancestral Root proceeded to give the final instructions.
"The demonic heavens will descend every certain amount of time. The faster you eliminate them, the more time you will have to rest before the next..." Before the Artifact Spirit could finish his sentence, the Neo-Demon flashed to the sky like a shooting star.
When Ancestral Root saw Zatiel going to the demons instead of waiting for them, a small smile appeared on his face.
'As expected of someone that passed the tenth level of Endless Hell. A true Champion will not wait for the enemy. He will rise to the sky and kill them all.'
Just as Zatiel was about to clash with the first row of demons, the Rebirth Eye glowed and unleashed a unique form of Soul Eradicator.
"All-Heaven Soul Eradicator."
Instead of only targeting one individual, All-Heaven Soul Eradicator hit all the demons in the Rebirth Eye's vision field. Its offensive power was less, but its range was incredible.
The Neo-Demon spent a third of his Mind Force, but that did not stop a smile from appearing on his face as the light in more than fifty thousand demons extinguished.
As the demons fell from the sky like water drops, Zatiel pushed the All-Devouring Domain power to the maximum, and the bodies began to fly toward him.
The domain decomposed the corpses and transformed them into pure energy that the Neo-Demon would send to the Dream Dimension to replenish his Mind Force.
Even with his fantastic speed, it took him a minute before nearing living demons again. Despite killing so many of them in a second and advancing hundreds of kilometers, he still could not see the end of the demonic heavens.
Just like before, he unleashed a Soul Eradicator that killed every demon in sight, used their corpses to replenish his Mind Force, and kept rising higher.
After a month, for the first time, some demons managed to preserve their lives. Of course, the All-Heaven Soul Eradicator severely harmed their souls and paralyzed their bodies.
Zatiel's All-Devouring Domain swallowed the corpse around him, and he sent the bone daggers to the weakened demons.
He did not activate the magic matrices or runes in the daggers, but their raw power was more than enough for those paralyzed demons.
In less than five seconds, the eighty-one daggers pierced the brain and shattered the souls of five hundred demons.
Zatiel butchered heaven after heaven of demons solely with the bone daggers and All-Heaven Soul Eradicator for the next couple of years.
By the time his killing count surpassed the two hundred and fifty million, Demon Lords able to respond to the bone daggers even after being hit by the All-Heaven Soul Eradicator appeared.
The Neo-Demon's eyes narrowed, and he marked the location of every one of those demons before channeling some of the energy stored in the All-Devouring Domain into the bone sword and shot fifty thin arcs of bluish-purple fire.
The fire arcs cut every demon in half, and the domain swallowed their pieces.
Years passed, and Zatiel annihilated more and more demonic heavens. Even someone with an endless amount of energy would find it hard to keep their battle awareness for such a long time due to mental fatigue.
Luckily, as a Rank 5 Animus, Zatiel could use his Mind Force to allow his brain to rest while still fighting.
Finally, after eight years of never-ending slaughter, the final demonic heaven appeared in his sight.
A solemn expression appeared on the Neo-Demon's face when he felt the one hundred Peak Rank 5 soul forces, ten of whom carried an aura equal to an absolute Peak Marquess.
Had these Demon Lords been capable of working as a team, even a powerful Demon Duke would find it hard to survive against them. Luckily, they were completely crazy and only knew to attack like mindless beasts.
Of course, even if they were incapable of coordination or any form of strategy, if Zatiel was careless, they could overwhelm him with their power and numbers.
'Time to use my new weapon.'
