Time

Zatiel floated in the center of a massive pool filled with life force and blood energy, and the expression on his face depicted immense agony. A powerful purple fire overflowed the inside and outside of the Neo-Demon, forcing him into a state of constant destruction and regeneration.

Death force inundated Zatiel's cells, destroying more than ninety-nine percent of them. Those who were able to resist the pressure of this destructive energy, proving their superiority, were flooded with life force, entering a hyperactive state of mitosis, regenerating the missing tissues.

The process had to be done in all the body at the same time to avoid flaws. Even a Rank 6 life form would find it hard to monitor all of his cells simultaneously. 

The Neo-Demon felt his head would explode due to the massive amount of information he processed every second, but did not back down and keep pushing his cognitive abilities to the next level with Mind Force.