Even though the process was dangerous the benefits were true immortality. The immortal cultivators would no longer be forced to rely on their physical bodies to survive.
They would be capable of restoring their bodies to their prime and maintaining it forever while still keeping their brains sharp. Not only that even if their heads were blown off their shoulders they could survive as long as their crystal brain was intact.
So once the crystal brain was fully formed and synced with the user's original brain they were presented with a choice. They could follow the path that the Immortal Welse followed and actively remove their crystal brain, skull, and spine from their body.
This would allow them to not have to worry about what happened to their body at all. Even if every single one of their atoms were torn apart they could always come back.
What was more important however was that it allowed for there to be an infinite amount of possibilities of what they could do with their crystal brain, crystal spine, and crystal skull. They could use them to create extremely powerful weapons, split them up then bury them deep underground all over the world so their enemies couldn't kill them, or even form a second body that can act as their clone.
There were a large number of options for those immortals who took this path. But there was a serious consequence for removing it from their original bodies.
The first was that their improved information processing ability was drastically reduced and their ability to continue improving their immortal abilities would slow down. For many immortals that chose this path, they felt that these consequences were not enough to make them change their minds but for many others, they couldn't bear it.
So they chose the second option which was to keep their crystal brain, crystal skull, and crystal spine all inside their original body. This allowed them to continue their pace of improving rapidly while still maintaining their improved information processing speed.
This gave them strong combat abilities and were often much more clever and tricky compared to their counterparts which lead to the book calling those who followed this path Plot Immortals and those that followed the other path Living Immortals.
"So Immortal Welse is a Living Immortal as he had separated his crystal brain, crystal skull, and crystal spine to create this Crystal Sword." Yoze thought to himself as he flipped the page to continue reading hoping to get more information.
"The rest of the book is blank,"
The moment Yoze turned the page he was greeted by blank pages and understood that this was most likely Immortal Welse trying to stall so he could think of a way to escape. So Yoze simply decided to signal his spiritual energies to devour Immortal Welse's spiritual energy faster and cause more pain.
As Yoze watched his spiritual energies take out chunk after chunk of spiritual energy away from Immortal Welse while each one continued to grow stronger he could see the Crystal Sword's trembling grow stronger as well.
"As long as you just give me the rest of the immortal cultivation manual and stop trapping my spiritual energy then I'll let you go. I don't have an interest in staying here for decades in a fruitless attempt to kill you." Yoze sighed as he tried to convince Immortal Welse again.
Immortal Welse violently shook as he felt his rage boiling up again after Yoze once again mentioned that he was trapping Yoze's spiritual energy. He had already gotten rid of his spiritual self-defense which had stopped Yoze from retrieving his spiritual energy.
Now Yoze was still asking him to stop trapping his spiritual energy when he could easily retrieve it. Feeling that the pain coming from his mind increased Immortal Welse's desire to not give Yoze anything increased.
But he knew better than anyone that he couldn't last more than ten hours at this rate and needed to figure out a way to escape. Or at least figure out a way for Yoze to stop his spiritual energy attacks from damaging his spiritual energy.
So Immortal Welse quickly creates a few more blue tattoos and sent them into the pages of the book. The first blue tattoo simply asked Yoze to stop his spiritual attacks while the rest added a few more pages to the Immortal Tattoo cultivation manual.
"See that wasn't so hard. All I need is the rest." Yoze said with a smile as he ordered his spiritual energies to slow down their devouring.
Yoze quickly read the added pages and was happy to see that they included spells and abilities that could be used in the Nerve Accumulation realm. After reading them and etching them into his memory, Yoze reapplied the pressure of his spiritual energies to force Immortal Welse to spit out more.
Even though Immortal Welse's anger and hatred continued to increase he continued to give Yoze a few pages of his immortal cultivation manual every time Yoze ordered his spiritual energies to increase their devouring speed. What made him the most helpless was the pressure of the spiritual attacks was increasing with time along with the speed of devouring spiritual energy.
So his medication of being able to last 10 hours of the constant bombardment of spiritual attacks was cut down to only 5 hours and was rapidly approaching.
What he hated the most was that he could see that even though Yoze seemed to be under the impression that his spiritual energy was endless and wouldn't be able to spiritually kill him, Yoze wanted to keep him trapped forever. Immortal Welse knew that he could take the rest of telling Yoze that he was reaching the limits of his ability to regenerate spiritual energy but that would lead to him losing the bit of leverage he had.
Losing the bit of leverage he had would instantly put him in an even more dangerous position. From how much ruthlessness Yoze had shown him for the past few hours Immortal Welse did not doubt in his mind that Yoze would devour his spiritual energy until he was barely a single lick from dying.