Before starting, Yun Jin first checked her Emotional Value. It went up and down, and right now, it still sat at over five hundred billion.
That sounded like a lot, but it burned through fast. Especially with the books in this library. The collection was vast as a smoke-filled sea, and if she wanted to improve every single one…
Even all five hundred billion might not be enough. She had to make choices.
Yun Jin decided to keep three hundred billion as a baseline. No matter how much she added or spent later, she wouldn't let it fall below that.
After all, the tribulations of the Five Immortal Emperors were right around the corner.
And after that, the real challenge—the Polar Night—would arrive.
Emotional Value had to be saved, stacked up, and used to break through the Zhenmo Realm.
From the Devouring Demon God's vague words, Yun Jin already knew that even in the Polar Night Demon World, breaking into the Zhenmo Realm wasn't going to be easy. But for her, it was something she had to accomplish.
During the three-thousand-year Eternal Night, she had to reach Zhenmo!
So this time, she could only use two hundred billion of her Emotional Value.
Yun Jin instructed the system, "Scan the entire library, then filter out the techniques, picking the ones most suitable for me and improve them. Total cost: two hundred billion Emotional Value."
The whole library was now fully open to Yun Jin, and by extension, open to the system. Scanning alone didn't cost too much.
Two billion Emotional Value, and the system had a rough idea of the information. Then, after some filtering, a long list was made.
Yun Jin followed the list and first went to the library's first floor. She pulled out all the tomes on the list from that floor and began improving them carefully. These techniques were already good, worthy of being collected by the Devouring Demon God. But only after being refined by the system would they truly suit her.
Many of these techniques, once she returned to the Vast Azure World, could be shared with others, strengthening the little world as a whole.
In short, these books wouldn't just increase Yun Jin's power—they'd become the foundation for the Vast Azure World's strength.
The benefits were massive.
The Devouring Demon God really was a good demon!
After a brief moment of reflection, Yun Jin dove into her long seclusion. Before, training the Dark Star Codex and Falling Stars in the Night had barely taken half a year. Now, she had over nine years to cultivate and comprehend these techniques.
The Devouring Demon God watched quietly.
Yun Jin was completely immersed in one exquisite technique after another.
He smiled faintly.
Before, Liu Yue had mastered three fourth-rank Primordials, and he'd bragged endlessly to the other demon gods.
But now, the Devouring Demon God pondered how to conceal Liu Yue's true strength a bit.
They demon gods had seen countless prodigies of the mortal world. Even the so-called unparalleled geniuses were nothing new to them.
Liu Yue's talent before wasn't enough to make anyone wary.
But now…
If her talent was fully revealed, she'd likely make the other demon gods uneasy. He had to help her cover it up. A little troublesome, but overall, a joyful kind of trouble.
After watching Yun Jin for a while, he closed his eyes.
Most of the Eight Great Demon Gods spent the majority of their time asleep.
Not because they wanted to, but because during the eternal day, only by sleeping could they return to the Eternal Night and continue growing stronger.
Even if the growth was slow.
Still, it was better than nothing.
Occasionally, the Devouring Demon God would wake and glance at Yun Jin.
Every time, she was studying different tomes on different floors.
He was slightly puzzled.
Usually, picking one or two techniques to focus on was enough.
Why was Liu Yue researching so many at once?
But he didn't worry too much.
He guessed Liu Yue had spent years wandering outside, never seeing such treasures, so when she suddenly saw them, she wanted to explore everything.
The Devouring Demon God forgave her for that.
The child had a pitiful past; not seeing good things before was normal.
This decade would just be her chance to broaden her horizons.
He drifted back to sleep.
Time passed.
Only three months remained until the ten-year mark.
Yun Jin finally emerged from her long study.
A spark of joy shone in her eyes.
After ten years immersed in countless tomes, the results were tremendous.
The Devouring Demon God's collection and his own cultivation of Primordials were closely linked. This intense study had yielded much, but the most crucial were two second-rank Primordials: the Devouring Primordial and the Primordial Darkness.
Yun Jin had brought both to their final step, only lacking the last strand of True Meaning to fully master them.
She guessed the Devouring Demon God himself had completely mastered both the Devouring Primordial and the Primordial Darkness!
On top of that, after all these years, how many other Primordials he'd mastered, whether there were more second-rank ones, she didn't dare imagine.
She could only be certain:
The Eight Great Demon Gods probably hadn't mastered a single true first-rank Primordial.
Otherwise, the Polar Night Demon World would already be united.
Another gain from these ten years was the Dao Fruit in the Vast Azure World. It had subtly been absorbed by her.
Now, the number of Primordial Laws Yun Jin controlled was impressive. She was trying, in just a few decades, to catch up to what the demon gods had built over tens of thousands of years. It was difficult, but she had to succeed.
Her grasp of Primordials was no longer what it had been.
After comprehending the Five Elements Primordial and breaking through the third layer of the Yin Yang Codex, she felt any Primordial below second-rank no longer improved her power significantly.
For example, she casually comprehended the third-rank Primordial Stars. She didn't bother choosing a True Meaning and just used the Falling Stars True Meaning from a sword technique.
After all, rank mattered. No matter how strong a third-rank True Meaning was, it was crushed beneath a second-rank Primordial.
Now, with two second-rank Primordials at the verge of mastery, once completed, she'd have three second-rank Primordials under her belt.
Add that to the third layer of the Yin Yang Primordial,
And she hoped it would be enough to counter the Five Immortal Emperors' schemes.
Yun Jin took stock of her gains.
The next moment, she was instantly transported out of the library, back to the edge of the Demon Pool.
The Devouring Demon God's clone smiled kindly at her.
"Only three months left until the ten-year mark. Reserve one month for travel. The next two months, stay in the Demon Pool. First, bring your strength to the peak of Tianmo."
"Yes," Yun Jin replied respectfully and stepped into the Demon Pool.