Fiendish Underworld Metropolis was without doubt Diabolical Dragon King's territory. It was hard for outsiders to even enter, unless they were permitted.

It was near impossible for Wu Yu and the others to go in, unless he had a plan. Which he did. Which was to transform into Primitive Demon King.

Although Primitive Demon King often moved in the vicinity of Fiendish Underworld Metropolis, but he was not one of them. He could enter, but had to be careful. Primitive Demon King had a friend within Fiendish Underworld Metropolis, and so could enter without problems.

As for Full Moon of Nanshan and Ye Xixi, they each used their respective techniques, one using Gone from the Skies and the other turning into a speck of black sand which Wu Yu carried.

In this way, the three could enter Fiendish Underworld Metropolis.

After making their plans, the trio rested for more than a month. They had more or less consolidated all their recent learnings, and then set off on their journey.

In this time they had left the black sea behind, finding a random void chasm in the Demon Immortal Realm to hole up and cultivate in.

Since their departure, no alert had gone out. After all, a mere month was nothing much to demon immortals, and nothing at all to demon kings. A few less people around would not go noticed.

By the time people realized that Dreary Gold Demon King and Black Yama Demon King were dead, they would be long gone.

The three headed for Fiendish Underworld Metropolis.

It sat on a prime location, where the immortal qi was abundant. Within the entire Demon Immortal Realm, only a few of the most powerful demon kings could stake their claim to such land.

And the owner, Diabolical Dragon King, still stood a chance of rising to become an eternal immortal emperor. After all, compared to the other demon kings of his caliber, the Diabolical Dragon King was still relatively young.

Demon Immortal Realm was quite huge, and they spent more than a month just getting to Fiendish Underworld Metropolis.

Strictly speaking, Fiendish Underworld Metropolis was not a city, but an entire area shrouded in the black Fiendish Underworld qi. There were many smaller areas inside, similar to Peak of the Granular Wooden Realm or the black sea.

There were tens of thousands of demons cultivating here, all of them the subordinates of the Diabolical Dragon King. One had to be at least of the Immortal Lord Realm in order to qualify to join the Diabolical Dragon King's camp.

These tens of thousands of demon kings all worked on behalf of Diabolical Dragon King. More than 5000 of them were Great Void Demon Immortal Realm demon kings. The entire Fiendish Underworld Metropolis was one of the strongest forces in the Demon Immortal Realm.

Looking out, the Fiendish Underworld Metropolis was shrouded in Fiendish Underworld qi. Just like immortal qi in the sky palaces, it was very important for the cultivation of demon immortals. Few were the places with dense immortal qi.

Just by casting his gaze forth, he could feel the rich power that this land held.

If demon immortals could cultivate here, they would improve more than ten times faster, compared to cultivating in other qi-starved places. Perhaps even more than ten times - it was rumored that the Diabolical Dragon King's ability to claim such a large piece of territory proved that he was one of the strongest in the Demon Immortal Realm.

"Currently, there isn't even a single eternal demon emperor in the whole of the Demon Immortal Realm. But if things continue as they have, this Diabolical Dragon King might well become one."

Full Moon of Nanshan told them, as they gazed out at the cloudy Fiendish Underworld Metropolis.

His improvements during this period had been extremely quick, even reaching the Great Void Immortal Realm. This was because he had used the 10th Grade Mark of an Immortal King, and so his future would surpass even those like the Primeval Mighty Miracle God.

The other two were naturally the same. Although they were demon and ghostly cultivator, but Wu Yu did not see much of a difference between them and immortals.

At Fiendish Underworld Metropolis, Fiendish Underworld Metropolis and Ye Xixi also used their techniques to hide.

Gone from the Skies and the black sand transformation were again put to good use.

They were comparable to Wu Yu's Somersault Cloud in terms of how marvelous they were. They were definitely never seen before in the Demon Immortal Realm, and even by the immortals in the Hells or sky palaces.

Perhaps only the most powerful of immortals or ghostly immortals would have such skills.

Therefore, it seemed like Wu Yu was entering Fiendish Underworld Metropolis alone, in the identity of Primitive Gold Devouring Rat.

Before, Wu Yu had sent an immortal message talisman to try and contact Jiu Ying, but had not received a reply.

This made Wu Yu both worried and wary.

Usually, Jiu Ying should have risen to an elevated status as the adopted son of the Diabolical Dragon King. It was impossible that he would not reply an immortal message talisman. In all these years, it was inconceivable that Jiu Ying should know that Wu Yu had come to the Demon Immortal Realm to find him, but not reply.

Of course, it was also possible that Jiu Ying was in seclusion, and then not replying would be understandable. But for how long? Wu Yu did not know, and Primitive Demon King was not at a high enough level to be privy to such information. All he knew was Jiu Ying's whereabouts.

In any case, Wu Yu decided to proceed with caution. He could not just barge in, and so the guise of Primitive Demon King was his only method of entering Fiendish Underworld Metropolis.

Full Moon of Nanshan used Gone from the Skies to follow by Wu Yu's side. In truth, given his current mastery of Gone from the Skies, it was highly unlikely that anyone within Fiendish Underworld Metropolis could detect him.

In the 5000 years of cultivation in the black sea's void chasm, he had not only reached the Great Void Demon Immortal Realm, but had also polished his Mystiques and techniques.

Just through the Imparting that Wu Yu had given him from the eternal demon emperor, he had been able to further his Mystiques so much that perhaps not even the Diabolical Dragon King himself could detect Full Moon of Nanshan's Gone from the Skies.

And Ye Xixi was doing well also. In her black sand form, her signature had become even more undetectable, erasing any sign of life completely.

When in the black sea, her black sand transformation had still be trapped in the Dreary Elemental Golden World that Dreary Gold and Elemental Gold Demon King had created together. But now, that could not happen.

This meant that there were not many left in the Fiendish Underworld Metropolis who could subdue her. It would have to be someone of the 6-heavens demon king level or above, which were fairly respectable in strength. Although they were not at the very top, but they still commanded considerable power.

Such presences were rare in the Fiendish Underworld Metropolis, and one would not happen across them casually. Therefore, neither needed to really fear discovery.

Wu Yu used the Heaven Devouring Titanic Beast's power to change into the Primitive Gold Devouring Rat.

Primitive Demon King was an often-seen figure moving in the vicinity, and his presence was not strange to the demon immortals of Fiendish Underworld Metropolis. He would not attract too much attention entering Fiendish Underworld Metropolis.

Through searching Primitive Demon King's memories, Wu Yu knew that he had a good friend in Fiendish Underworld Metropolis, by the name of Caliginous Shadow Demon King. He decided to seek out this Caliginous Shadow Demon King to find out more.

This was a 4-heavens demon king, which was considered quite good, and Caliginous Shadow Demon King was quite well placed in the Fiendish Underworld Metropolis. Therefore, he might know more about the Diabolical Dragon King's news.

Entering Fiendish Underworld Metropolis, the rich Fiendish Underworld qi assailed them. It must feel good for the demon immortals.

This sort of Fiendish Underworld qi was just like immortal qi in the sky palaces, and yet not completely the same. It was more suited for demon immortals to absorb and cultivate.

From his memories, Wu Yu recalled the fastest way to one of the better-located peaks, where Fiendish Underworld qi was dense.

Along the way, many demon immortals had spotted and recognized him. Primitive Demon King was still a 6-heavens demon king, and not someone that these lesser demons would dare to cross.

Besides, it seemed like Primitive Demon King had a bit of a reputation. Along the way, the other demon immortals or even demon kings that spotted him did not greet him, but instead kept their distance.

This saved Wu Yu some trouble.

Although he had Primitive Demon King's memories and could replicate his personality in his conversation, but skipping such troubles was always safer, and he could keep moving towards his goal of Jiu Ying.

After about half a month, Wu Yu finally reached a peak in Fiendish Underworld Metropolis. This peak belonged wholly to Primitive Demon King's friend, Caliginous Shadow Demon King!

As Wu Yu arrived, Caliginous Shadow Demon King was currently cultivating in his true form, a caliginous devilworm. The worm body was imbibing the Fiendish Underworld qi at the top of the peak, continuing to reshape its body with it, and advance towards a higher level.

Seeing Caliginous Shadow Demon King in this state, Wu Yu breathed a sigh of relief. It meant that not much had changed in these 5000 years. Caliginous Shadow Demon King was still only a fourth tier Great Void Demon Immortal Realm cultivator, albeit slightly stronger. He was also a shade more threatening than Primitive Demon King's memories revealed.

Of course, to Wu Yu, or perhaps to Primitive Demon King, a 4-heavens demon king did not count for much.

But he could not look down on this person. After all, he was here with a request.

As Wu Yu arrived, Caliginous Shadow Demon King seemed to instantly know. He paused his cultivation, as it was not at a crucial stage. Instead it was the sudden appearance of the long-lost Primitive Demon King that both surprised and pleased Caliginous Shadow Demon King.

After all, being on good terms with a 6-heavens demon king was not a bad thing for Caliginous Shadow Demon King. When he went about his everyday business, some would even show him a little more respect for it.

At first he had been doubtful, wondering if Primitive Demon King had been finished off outside...... Now it seemed like those worries were baseless. Of course this was worth celebrating.