After retrieving the Ten-thousand-year Cold Marrow, Xu Hei's right hand was already frozen stiff, and he felt as if the spiritual power in his veins was freezing as well.

This was even with the box's seal intact. If the seal were opened, he feared he would suffer severe injuries immediately. No wonder Li Changge had advised him to find a place of extreme Yang before opening it.

Next, Xu Hei asked a few other questions.

For instance, why could the Heavenly Demon Technique suppress the ancient ferocious beasts here?

The Old Tree chuckled sinisterly, quite pleased with himself, and said, "I beat up all the ferocious beasts here over and over again for hundreds of thousands of years. It's no wonder they fear the Heavenly Demon Technique."

Although he had anticipated this, Xu Hei was still speechless.

"So, you've been doing this for 350,000 years?"

"What else could I do? I was trapped here and couldn't leave, so I had to pass the time this way. Unfortunately, there's not a single awakened spirit here, so I can't communicate with them. I can only slightly control their actions through parasitic roots," the Old Tree grumbled.

Xu Hei was taken aback and quickly asked, "You can't leave?"

Xu Hei then learned that the light gate at the exit was also a restriction, capable of exterminating all ancient creatures in the Land of the Moon.

Unless it was an ancient spirit medicine without cultivation, or a dead body taken out by someone, the restriction wouldn't be triggered.

The creator of Guanghan Palace intended for them to act as guardians, so naturally, they wouldn't allow them to leave.

"This is the Yin-Yang Nirvana Formation set up by a supreme power. If a Yin spirit like me enters the restriction and disrupts the Yin-Yang balance, I will be immediately obliterated! Similarly, an extreme Yang entity on the other side would face the same fate. I advise you not to think about it," the Old Tree asserted confidently.

Xu Hei fell into deep thought.

Seeing Xu Hei still pondering, the Old Tree sneered, "I know you have a broken cauldron that even I can't see through, but I advise you not to have any illusions. The Stealing Heaven Bag of the old Tian Ji was destroyed in the same way. He was even more confident than you at the time."

Xu Hei's expression turned strange as he said, "Senior Tian Jizi shouldn't have been such a reckless person."

The Old Tree's eyes widened as he shouted, "Why are you looking at me? Do you think I destroyed the Stealing Heaven Bag?"

"I didn't say that!"

"But that's exactly what you're thinking!"

"…"

The Stealing Heaven Bag, similar to the Demon God Cauldron, could shield from divine sense and was extremely sturdy, making it an excellent container for taking ancient ferocious beasts out.

Hei Huang once borrowed this item, hoping for a stroke of luck. He put two Demon Blood Vines and a Yaksha King inside, but not only was the Stealing Heaven Bag destroyed, his clone was also wiped out, and even his true self was affected, nearly perishing here.

This incident also led Hei Huang to leave a wisp of his soul behind.

Of course, he would never admit to this.

Xu Hei asked seriously, "Don't you want to leave?"

"Of course I do! I've thought of a way: let my soul fragment leave the body, and you take it out first. Once outside, I can possess this tree again. Although it will take some time, it's the safest method," the Old Tree said.

Hei Huang's soul fragment was not of this realm, so this was a reasonable plan.

Xu Hei nodded, "Let's discuss this later. Now that I finally have time to cultivate in seclusion, I need to prepare thoroughly before leaving."

The Old Tree chuckled mischievously, "Of course, your Lunar Mystic Fire hasn't been refined yet. It's the ultimate Yin fire in the mortal realm. Cultivate it well, and it will definitely become a powerful weapon."

"Once you get out, find a wisp of Solar Essence Fire and merge them. It might evolve into the legendary Yin-Yang Sacred Fire and rank on the Spirit Realm's Heavenly Fire list."

"There are still some spirit medicines here. I'll go find them for you."

The Old Tree's roots lifted as it strode into the distance.

After the Old Tree left, Xu Hei took out two Dragon Scale Fruits, his expression peculiar.

Since the spirit medicines here could be found, wasn't he at a loss for buying these two fruits?

Xu Hei's face turned dark as he swallowed the Dragon Scale Fruit in one gulp and quickly refined it.

After consuming the fruit, Xu Hei felt a surge of power rushing to his crown, giving him a deep sense of joy from his soul, like a parched person drinking from a clear spring, as if he had soared to the heavens.

No wonder he instinctively wanted to devour it; consuming it brought such pleasure.

Soon, thick dragon scales appeared on Xu Hei's skin, starting from his head. The dragon scales quickly transformed into black crystalline forms.

The size hadn't changed, but in terms of hardness, it was more than twice as strong as before!

"It actually has such an effect!" Xu Hei was secretly delighted.

With these dragon scales alone, he could have the defense of the Rock Crystal Guardian. The combination of the two would be even more astonishing.

However, after three days, the dragon scales had only transformed the entire head area, and the Dragon Scale Fruit was already fully refined.

With one fruit left, Xu Hei swallowed hard and consumed it again, continuing to refine it.

...

In the blink of an eye, a week quietly passed.

The people outside were already impatient.

"Hmph! That kid hasn't shown up yet; it seems he's really dead," Flame Demon Ancestor snorted coldly.

The others nodded in agreement.

They had been discussing for seven days and couldn't stay in Guanghan Palace forever. This place always gave them an ominous feeling, so it was better to leave as soon as possible.

Of course, they wouldn't let Xu Hei go either. They would leave some cannon fodder here to guard. If Xu Hei suddenly appeared, they could be alerted in time.

"Wei Wudao, here's what was promised to you, not a single one less!"

Flame Demon Ancestor took out a blood-red soul flag and handed it to Wei Wudao.

"Thank you, Flame Demon Daoist!"

Wei Wudao took the soul flag, scanned it with his divine sense, and a bright smile appeared on his face.

According to the agreement, as long as their Ancient Tomb Sect took down Xu Hei, they would receive a billion living souls.

Although it wasn't done by him, Grand Elder Gu Xiao had held Xu Hei back, becoming a crucial help in killing Xu Hei. Everyone saw it with their own eyes, so it couldn't be denied.

Moreover, Flame Demon Ancestor also had the intention of forming an alliance, so having one more superficial ally didn't hurt anyone.

"Among this billion living souls, besides mortals, there are also many high-level cultivators. With this, as long as I have a few years to refine these souls, I have a good chance of reaching the late Divine Transformation stage!" Wei Wudao was overjoyed.

Before leaving, they set up several formations here. The Blood Refining Sect, to be safe, left behind a Divine Transformation stage elder, then exited the hall and entered the passage ahead.