Ning Yu and the others went straight to the deepest part of the Heavenly Domain, where the legend was the Land of Eternal Darkness.

In such a brilliant realm as the Heavenly Domain, it was shocking that there would be such a terrifying place as the Land of Eternal Darkness.

The Land of Eternal Darkness is an absolute forbidden place in the Heavenly Domain, and it is also an absolutely fierce land, unless someone like the Reincarnation Heavenly Emperor has reached it, no one will dare to enter it.

Ning Yu and the others were stunned when they arrived at the eternal dark place, where the black waves were rolling, vast and boundless, how big Ning Yu was at all, it seemed that this place was already bigger than the Heavenly Domain, the Immortal Domain and the Ghost Domain.

"The Ten Fingered Black Mountain is in this eternal dark place, that is the source of time, and that person is on that mountain, sitting and watching the years change, looking down on the world, he is the real immortal!" said the Endless Heavenly Emperor.

The Ten Fingers Black Mountain is called the source of time, the Holy Mountain is called the source of life, the Burial Immortal Mountain is called the end of everything, and the three mountains are collectively called the three most terrifying Tianshan Mountains in the world.

"Have you ever been in?" Ning Yu was no stranger to these, and he had already learned too many secrets so far.

Heaven and earth were composed of chaos before they were born, but chaos has two colors, one is white chaos and the other is black chaos.

This gray area is now heaven and earth.

With the formation of heaven and earth, the white chaos and black chaos disappeared directly, but two creatures were also born with the sky, one was the white ancestor with the white chaos will, and the other was the black ancestor with the black chaos will.

The White Ancestor and the Black Ancestor are also called Yu Ancestor, and they are a higher realm above the peak of the Yutian Emperor, and they are the most powerful realm under the heavens.

Since the birth of heaven and earth, there are only two who can be called Yu Zu, that is, the White Ancestor and the Black Ancestor.

The white ancestor was born, the black ancestor died, and the two were destined to be born to resist each other from the beginning of their birth. Later, the evolution of heaven and earth appeared to regulate the order of heaven and earth, and all spirits of heaven and earth began to rise, but the immortal matter was certain, which threatened the true immortality of the black ancestor, and the white ancestor conformed to the way of heaven and advocated the equality of all beings, so the two went against each other, and finally caused a great war.

At that time, there were reincarnation Heavenly Emperors, Chaos Heavenly Emperors and others who stood on the side of Black Ancestor, and on the side of Bai Zu, there were mainly the newly born Heavenly Dao Dao Spirit Tree, the newly rising Ancestor of Warcraft Qinglong, and the Monkey King of the Fighting Clan.

Originally, the two sides were indistinguishable, but Heizu directly threatened Bai Zu on the grounds of destroying the common people in the world, causing Bai Zu to sacrifice himself to become the whole world.

But Bai Zu knew that as soon as he fell, this heaven and earth would become a world where Hei Zu acted arbitrarily, so he laid out a big game before he died, and this game was gradually revealed after his death, and the key was Ning Yu.

Ning Yu's growth left traces of Bai Zu everywhere, otherwise he would not have come to this day.

Because after the death of Bai Zu, heaven and earth are the world of Black Ancestor, and he can peep and control the fate of any living being, but he can't control Ning Yu's fate, which becomes the only variable in this world where Ning Yu is the world.

And all this is precisely because Bai Zu deceived the heavens, which made a flaw appear in Hei Zu's eyes, and the place where this flaw could not be seen was the route of Ning Yu's growth.

"I've been in, many people have gone in, because there is power beyond the peak of the Yutian Emperor, but no one dares to go deeper, because it's very terrifying, even if I wait for chaos, I will be wiped out. "There is no end to the Heavenly Emperor's Dao.

After a pause, he continued to sigh, "Actually, there was no such place for eternal darkness here, what did you see in it?"

Ning Yu frowned slightly, he looked towards the place of eternal darkness, there was nothing at first, but soon he noticed that something was wrong, and said in a lost voice: "This place of eternal darkness is cold and desperate, more terrifying than the heaven and earth killing machine, but there are a lot of undead substances shuttling inside, and the further you go inside, the more undead matter there is!"

Ning Yu was shocked, this place of eternal darkness was just like the original Zhuxian Sword Array, and there was vitality shuttling through it.

"Yes, this place of eternal darkness exists to devour and store undead matter. You should have found some secret realms, where there is a black tornado pillar, and the wind pillar runs through the three domains, the purpose of which is to gather the immortal matter of the dead person, especially the person who has been greatly cultivated, here and let that person devour it. After that person devours it, he can guarantee true immortality, and as his lifespan increases, the immortal matter will overflow and continue to create new life, he will continue to harvest, and so on, he can be truly immortal!"

Cold sweat broke out on the back of the Endless Heavenly Emperor, and he couldn't help but fur at the thought of that person's methods.

Ning Yu had expected this for a long time, but this time he really went to its roots, how shocking it was can be imagined.

"The undead matter inside is the forbidden body of that person, you can go in, but if you dare to devour the undead matter, it will definitely be wiped out at the first time, so when we go in, we must not deliberately devour the undead matter inside. Nothing ends.

A sneer appeared on Ning Yu's lips, he wanted to kill that person, and this immortal substance was definitely the first one he attacked.

Of course, he is not so stupid, and he will not touch that person's bottom line when his strength is insufficient.

"The immortal matter in this is important to that person, but it is also important to us, and if we can handle it well, maybe we can make that person a big problem. Ning Yu said.

The Endless Heavenly Emperor thought for a moment, seemed to understand something, and couldn't help but nodded.

"Okay, time waits for no one, let's go in too, use the darkness inside to introduce our own Dao, that is to say, to lead the darkness into the Dao, so that when we want to fight that person, our chances of winning will be a few points higher!" Ning Yu took a deep breath and continued: "It is very dangerous to lead the darkness into the Dao, everyone may fall into the darkness and lose themselves, do what you can!"

After Ning Yu finished speaking, he took a deep look at everyone again, especially the dragon girls.

Because no one could predict what would happen to the cultivation of the underworld in the end, and they might all die in the last battle, Ning Yu wanted to take another look at these people, but he actually didn't have the bottom himself.

"Don't worry, we'll be fine, you just have to keep rushing forward!" the dragon girl smiled slightly.

"Hmm. Ning Yu nodded, and then rushed into the place of eternal darkness first.

He didn't persuade the dragon girl, because he knew that it was useless, no matter how he persuaded the dragon girl, they would not let him fight alone, they would definitely cultivate the underworld, no matter the outcome, they just wanted to be able to fight side by side with Ning Yu.

The Endless Heavenly Emperor was naturally no exception, and he also rushed in to cultivate the underworld according to what Ning Yu said, only in this way could he have a chance of winning.

Ning Yu kept rushing in, and the more he went inside, the more terrifying the dark power became, but he had no scruples and kept rushing until he felt that he couldn't bear it anymore before he sat down and devoured the darkness into his body and cultivated the underworld.

"I have cultivated nine realms now, and if I cultivate the underworld realm, it will be ten, once the ten realms are accomplished, I will definitely be able to open the sky!"

Ning Yu's eyes were scorching, and he was full of invincible confidence in himself and the future.

This time, Ning Yu's body gushed out of the rolling Dao fire, and the fire burned the darkness to form his own underworld, this process was very terrifying and thrilling, because the darkness was very domineering, and after being burned by the Dao fire, it erupted with terrifying power, and it was possible to wipe out Ning Yu at any time.

What's even more terrifying is that the darkness has a certain inviolable will, this will is more terrifying than the darkness, it always wants to suppress Ning Yu and then completely wipe it out, if it weren't for Ning Yu's firm will, it wouldn't be able to bear it at all.

In this way, 10,000 years have passed, and the tenth Dao ring has appeared in the nine Dao rings in Ning Yu's dantian. That ring was different from the others because it was black and shining with black light, which was more terrifying than the other nine realms.

After Ning Yu cultivated this black Dao ring, he felt that the darkness in his position was no longer a threat to him, so he stood up and rushed deeper into the depths, only stopping when he couldn't bear it anymore and continuing to cultivate.

Next, Ning Yu repeated the cycle like this, about 100,000 years later, his underworld was finally cultivated, but he had no intention of stopping at all, because it was not enough to cultivate the underworld, and he still had to integrate the underworld with the other nine realms, which was the most important thing.

"I have cultivated ten realms, if I can fuse them all, why is it difficult for me to open the heavens!" Ning Yu's eyes opened directly with the nine reincarnation eyes, but the center of the nine realms of the ring was full of darkness, and that was his tenth underworld.

At this time, it was easy for him to kill the Reincarnation Heavenly Emperor and others 100,000 years ago, because his combat power had increased several times and had reached the point of endless terror.

"The ninth chapter of my new exercise method is to fuse these ten realms, and then I will be able to open the heavens, then my ninth chapter will be called the ten realms of opening the heavens!" Ning Yu exhaled a breath of turbid air, and then fell into a crazy ten realms of fusion.

Now he is a few points weaker than Yu Zu, which means that it is not so easy for Yu Zu to kill him, so he knows that at most 100,000 years that person will wake up, and it is possible that because of his rise, that person will wake up in advance, and now there is really not much time left for him.

Then he entered the ninth chapter of selfless cultivation and the Ten Heavens without stopping for a moment.

Time flies, and soon another 60,000 years have passed, at this moment Ning Yu has fused six of the nine realms into the underworld, and only three of them are left for him to be done, and at this moment, he has already stepped into the Yu Ancestor realm with one foot, and the ancestral body is infinitely close to the celestial body, as for what state the strength has reached, he himself has no bottom, but he knows that it is absolutely ridiculously strong.

After that, another 20,000 years passed, and Ning Yu fused the two again, and as a result, he suddenly felt very frightened, because the person on the top of the Ten Fingers Black Mountain was about to wake up.

Ning Yu was terrified, and directly stopped the fusion of the ten realms, because in the end, it was the most difficult fusion of the love path and the underworld, so he instead frantically devoured the undead matter in it, and at the same time asked the dragon girl and them to stop cultivating, devouring the undead matter with all their might, and using the undead matter to help him carry out the final ultimate transformation.

The dragon girl also knew that this undead matter was very important to that person, and the other party was about to wake up, so they all devoured the undead matter desperately, completely cutting off what that person relied on for survival.