Abyssal Lord of the Magi World

Other than their Particles of End and Apocalyptic Stars, other phenomena were inside the Neo-Demons' skeletons. 

Ezequiel's ribcage contained a white lightning arc on the right and the Chaotic Core on the left. As for Zatiel's, he had his Karmic Samara Wheel in the right, the Chaotic Core on the left, but he also had a dark purple sphere in the center of his skull from which countless channels with crystalized vortex emerged. 

Issac was able to see all of that. He first focused on Ezequiel, and while the Chaotic Core drew his attention, the arc of white lightning was much more intriguing.

His eyes glowed as he attempted to decipher the mysteries behind it.

'A force that embodies the interaction between man and universe. How impressive, but even if I were to learn those principles, it would at most help my body but not my cultivation.' As a Primarch, Issac already reached the end of Rank 9, so the powers of a First Order Law Bloodline could not help him in that matter. 

Next, the Magus focus on Zatiel, starting with the Virtual Dream Core, then the Chaotic Core. It was when his eyes posed on the Karmic Samsara Wheel that a sense of utter shock assaulted him.

Issac's monstrous perception grasped some of the forces that formed that wheel containing phantoms of every race from the Prima Universe and Eldritch Universe. 

Unfortunately, perceiving the principles of the Karmic Samsara Wheel was not necessarily a good thing. Life forms could only decipher the laws at the Peak Rank 3 because only at this point were their souls powerful enough to tolerate their pressure.

Zatiel's bloodline embodied the realm above the laws, and a Being of Laws' soul was not powerful enough to endure their might.

"Ahem." Issac coughed some blood and took his eyes away. After a moment, he looked at the wheel again, but this time he did not dare to focus his perception on it. 

'What is that!' The Magus could not help but wonder how someone could contain such power inside their bodies. 

Neither of the Neo-Demons had time to wonder about the Magus Primarch. All of their focus was entirely on the destruction of their skeleton. 

Due to their bloodlines and continuous development, their skeletons were as hard as Rank 7 metals, so the amount of energy each cell needed to overload was higher. That meant that their foundations would be excellent and that they would have to carry on this insane agony for a much longer time. 

Usually, a Neo-Demon would finish the destruction of their skeleton in three to four days, but Zatiel and Ezequiel were still in the midst of it by day ten. 

The only thing left of the Neo-Demons' skeletons were their skulls and upper spinal columns. That was by far the most painful and difficult part.

Stopping now could still allow them to reform their bodies but would leave flaws that would become extremely difficult to fix, not to mention that it would also waste away some of their talents. There was no way Zatiel or Ezequiel would allow that, so they just pushed harder and kept destroying.

Finally, after seventeen days of excruciating pain, the Neo-Demons' destroyed their bodies entirely. There were no flesh, blood, or bones left of the duo, only a bloody fog.

Now that destruction ended, it was time for the rebirth part. The True Doomsday Bodies of Zatiel and Ezequiel emerged and immediately headed for the Particles of End. 

Each black humanoid adopted a solemn expression as they grabbed the Particle of End before thrusting them into their chest. They trembled as if they were about to shatter at any second, but the duo did not lose their focus and continued fusing the particle into themselves. 

The process was incredibly complicated and painful, but the black humanoids managed to fuse the Particle of End inside them, skyrocketing their power. 

"¡AHHHH!"

"¡AHHHH!"

Along with that roar of power, the bloody fog began to revolve around them, and the reconstruction started. First was the Infinity Hearts, the new home for the True Doomsday Bodies. Next came the nervous and circulatory systems, inner organs, skeletons, muscles, and skin. 

Unlike the destruction that carried on for several days, this part was much faster. In less than five hours, the black humanoids had fully reconstructed the bodies of both Neo-Demons.

There were, however, changes in them. They manifested as the Particle of End augmented the unique characteristic of their True Doomsday Bodies.

At the center of Zatiel's plasma halo, a red heavenly body, with the weight of a dwarf star and heat of a sun's core, manifested. Countless yang runes have fused with every cell, augmenting his endurance and strength to a ridiculous level.

In Ezequiel's case, he developed two new sets of arms and two faces, with each extremity covered in golden armor that made them as hard as a weak Rank 8 Artifact! But the most impressive changes were in his consciousness, which grew twenty times larger, making his already monstrous spiritual defenses even higher. 

Zatiel and Ezequiel opened their eyes simultaneously, and the moment they exhaled, an explosion of physical might emerged from them, shattering the space and generating storms.

The power of their life force was so immense that they would never experience natural death, and their existences underwent an unprecedented evolution. 

The Neo-Demons completed their Infinity Cosmic Rebirths, became Rank 7 life forms, and entered the Law Realm!

Zatiel's eyes landed on Issac, but he had not yet finished with his advance, so he limited himself to give a soft nod and carried on with the next phase.

They were Rank 7 life forms, but they needed to transform their Apocalyptic Stars into Astral Black Holes to complete their evolution fully. These new heavenly bodies would allow the True Doomsday Body Path of Power to rise through Rank 7, 8, and 9.

Neither Zatiel nor Ezequiel were worried about Astral Black Hole Genesis since, unlike Infinity Cosmic Rebirth, there was no danger.