Lin Jiufeng had completely entered the depths of the Death Realm.

According to the crystal skull, Lin Jiufeng had just crossed the boundary to the depths of the Death Realm.

Now, with every step, they might encounter danger.

Lin Jiufeng looked at the crystal skull and sighed. "You only spoke the truth now. You were lying to us all this time. It's simply despicable."

Black Skeleton and White Skeleton nodded. They even foolishly believed the words of the crystal skull previously. It was only because Lin Jiufeng was careful and never believed in the crystal skull that he forced it to tell the truth.

"Previously, we were unrelated and didn't know each other, so there was no need to tell the truth. Moreover, how should I know if you guys have any evil intentions after hearing my story? After all, I once stayed with the King of the Netherworld for a period of time." The crystal skull defended itself. It felt that it had done the right thing.

Lin Jiufeng didn't fuss about these. It was normal for the crystal skull to have its own worries. If it told Lin Jiufeng everything from the beginning, Lin Jiufeng would definitely suspect it.

"Since you followed the King of the Netherworld and stayed in the depths of the Death Realm for a long time, then tell me, is there anything in the depths of the Death Realm that I need to avoid?" Lin Jiufeng asked.

"Why, does Immortal King Lin also need to avoid others?" The crystal skull asked.

"Although I'm confident in being invincible, I also need to understand the enemies clearly. I'm not someone with a mental disability. If I can defeat the enemy, we'll proceed. If not, I'll cultivate more and become stronger before facing the enemy. In any case, it won't be long before I can suppress the depths of the Death Realm with a flip of my palm," Lin Jiufeng said confidently.

The crystal skull couldn't affect his confidence.

"In the depths of the Death Realm, you need to pay attention to a few major factions. Even when the King of the Netherworld was suppressing these few factions back then, she also spent a lot of effort. If you want to find the Well of Heaven Ascension, you will inevitably encounter them," the crystal skull said.

"What faction?" Lin Jiufeng asked seriously.

Confidence wasn't equivalent to being arrogant. To Lin Jiufeng, he was very confident, but he wasn't arrogant.

He still had to understand what he needed to understand.

The two skeletons listened attentively. They were weaker than Lin Jiufeng, so they naturally didn't dare to be careless.

After all, this was the depths of the Death Realm, not the periphery. Some of the fear in their bones appeared at this moment.

The crystal skull said, "In the depths of the Death Realm, there's a giant city. Inside are all giant skeletons that are ten meters tall. They are very terrifying. Each of them is a top powerhouse. Moreover, they seem to have mastered the ability to reproduce in the depths of the Death Realm. Most of the skeletons in the giant city have been born from 'reproduction' in recent years. Unlike us who died in the mortal world and then came to the Death Realm, they should be considered native skeletons of the Death Realm."

"They actually control the ability to reproduce in the Death Realm?" Lin Jiufeng was very surprised. These were skeleton creatures. They should be considered to be of the undead type. They only had souls, no bodies, and couldn't mate. How could they reproduce?

"Skeleton creatures can even reproduce?" Black Skeleton looked at the crystal skull in surprise. Its soul flame instantly skyrocketed.

It was very interested in this.

Black Skeleton really wanted to study how to reproduce. If they couldn't find the Well of Heaven Ascension and could only stay in the depths of the Death Realm forever, then reproducing wasn't unacceptable.

Although White Skeleton wasn't as exaggerated as Black Skeleton, its soul flame also silently surged.

The crystal skull said, "There's no need to be so excited. It's a mystic technique that only a few major factions know of. The Giant City is one, the Beast King City is another, and the Asura City, Hundred Battles City, and so on also know of this mystic technique."

"Why are they all cities?" Lin Jiufeng asked, puzzled.

"Because in the depths of the Death Realm, if you want to establish a faction, you have to build a city. The larger and stronger the city, the longer the faction can exist. When the faction is wiped out or the strongest powerhouses in the city are killed, this city will become deserted. Therefore, in the depths of the Death Realm, many abandoned cities were once memories of an era," the crystal skull explained.

"So, that abandoned city in the distance is just a memory of an era?" Lin Jiufeng pointed to the intersection of the sky and earth in the distance and asked.

White Skeleton immediately hugged the crystal skull and looked into the distance.

An abandoned ancient city stood tall between heaven and earth.

There was no domineering aura or majesty. There were only broken walls and ruins, and there were also countless traces left behind by the passage of time.

"It's the memory of an era. I remember it very clearly. Back then, when the King of the Netherworld brought me to the depths of the Death Realm, this ancient city had just been built. At that time, the people in the city were high-spirited and ambitious. But in the blink of an eye, 20,000 years have passed and they have become ruins. Those people back then have long become a pile of bones, and I have become like this now." The crystal skull recalled the past, and its tone was filled with emotion. It had personally seen this city being built, and now, it had personally seen this city fall.

Nothing in the world could withstand the passing of time.

The crystal skull fell into deep thought.

"Don't be emotional. Immortal King Lin has already gone over. Let's take a look too." Black Skeleton slapped the crystal skull, interrupting its emotional thoughts.

The crystal skull watched as Black Skeleton strode forward. It immediately put away its sad emotions and asked White Skeleton to speed up so that it wouldn't be left behind.

Lin Jiufeng arrived in front of this abandoned ancient city. What he saw was a place overgrown with weeds and bones everywhere. The city walls had collapsed and the city gate had been corroded.

White Skeleton rushed over with the crystal skull.

"It's been 20,000 years. Back then, this place was also a majestic huge city with a protective array formation. Even if a five-colored skeleton came to invade, this could still withstand it. But now, it has completely become ruins," the crystal skull looked at the devastated ancient city and said with emotion.

"Let's go in and take a look." Lin Jiufeng let the two skeletons enter first. He stood at the city gate without moving.

Black Skeleton and White Skeleton brought the bronze tablet and the crystal skull in and observed the surroundings.

Lin Jiufeng looked at the line of words that appeared before his eyes.

[Do you want to Sign-In before the abandoned huge city?]

Lin Jiufeng didn't expect that the first time he triggered the Sign-In after entering the depths of the Death Realm would be here.

But it didn't matter. It was fine as long as it could be triggered.

Now that he was already Immortal King Lin, the things that he signed in would probably rise to another level.

Lin Jiufeng was secretly looking forward to it.

[Sign in!]

Lin Jiufeng chose to agree.

[Sign-In successful. Received Barren Great Technique!]

This thing made Lin Jiufeng fall into deep thought.

What was the Barren Great Technique?

It sounded very powerful, but this was Lin Jiufeng's first time hearing it. He had no idea at all.

He could only look through the information and investigate this so-called Barren Great Technique!

[Barren Great Technique, a top cultivation technique created by a supreme existence. When it hits an enemy, it can essentially erase the traces of its existence from the world. Even if there's a method to revive it, it's useless!]

This information delighted Lin Jiufeng.

"Isn't this the nemesis of those who can be resurrected after death?" The corner of Lin Jiufeng's mouth curled up. He wanted to laugh, but he held back.

He was secretly happy!

The supreme existence who created this cultivation technique was definitely disgusted by those who could constantly revive.

He killed them time and time again and yet they could still revive. This supreme existence must have been very helpless.

Hence, the Barren Great Technique was born.

But there were no traces of this cultivation technique in the current world anymore. It was probably too powerful and was lost in the cracks of time.

Since ancient times, the stronger the cultivation technique, the harder it was to pass it down.

The easier a cultivation technique was, the more it could spread. Because it didn't matter if such a cultivation technique was spread, everyone didn't mind spreading it.

But for powerful cultivation techniques, everyone had a sense of possessiveness toward them and didn't want to share them with others. If one accidentally died, this cultivation technique would be lost.

The Barren Great Technique should have been lost just like that. Until now, it was signed out by Lin Jiufeng.

"But I've also learned the [See Immortality in the Cycle of Reincarnation] technique in the past. I can revive a few times." Lin Jiufeng suddenly remembered his past. He had also revived quite a few times in the past battles.

But now, See Immortality in the Cycle of Reincarnation was useless to Lin Jiufeng.

If the revival technique that he learned in the mortal realm could be of use to an Immortal King, that would be heaven-defying.

"Just nice. Since I don't have a method to revive now, I shall cultivate the Barren Great Technique. This way, my future opponents will no longer be able to revive. If they are killed, they will be dead for good. If I use the Barren Great Technique to wipe them away from the source energy of the world, no matter how many trump cards they have, it will be useless." Thinking of this, Lin Jiufeng became worried for his future opponent. Originally, when they were being killed, they would plan to revive and give Lin Jiufeng a heavy blow.

But now, if they were killed by Lin Jiufeng, they would never be able to revive again.

That would be very tragic.

With this in mind, Lin Jiufeng couldn't wait to learn the Barren Great Technique.

Immortal King Lin became stronger again.

At this moment, Black Skeleton, who was exploring the ancient city, shouted, "Immortal King Lin, there's nothing here. There are some small skeleton animals in the ruins, but the rest are drowned in the passing of time."

"If you guys couldn't find anything, then just come out." Lin Jiufeng wasn't surprised. This was also the reason why he wasn't willing to go in.

This ancient city was obviously so old that no one was interested in it anymore.

The crystal skull also said that this was built 20,000 years ago, the same time that the King of the Netherworld came to the depths of the Death Realm.

Now, 20,000 years had passed in a hurry. The treasures inside had long been taken away by the skeletons in the depths of the Death Realm.

Hence, the reason why this city existed was that it had nothing left.

Looking at the traces left behind by the aftershocks of the battle on the city walls, it was enough to prove that there were also endless battles here back then because of the competition for treasures.

The ruins of the ancient city might have been created at that time.

But now, without the treasures, there was no meaning in exploring. The ancient city only had some foundation left, which was why Lin Jiufeng noticed it.

Hence, he didn't go in. Instead, he let the two skeletons go in to take a look.

Not long after, Black Skeleton came out. It shook its head and said, "There are weeds everywhere and everything is withered. There's nothing here at all. What a pity."

White Skeleton followed closely behind and also walked out. It gained nothing.

As for the crystal skull, it discovered something new.

It floated alone in the air, looking quite eerie. It said to Lin Jiufeng, "Back then, the King of the Netherworld brought me along and passed by this city, leaving something in it. I went to take a look just now and it's still here."

Lin Jiufeng was about to leave. When he heard this, he raised his brows and asked in surprise, "What is it?"

Something that was left behind by the King of Gods of the God Race 20,000 years ago must be a treasure.

"A coffin!" The crystal skull said solemnly.