In the guise of Primitive Demon King, Wu Yu began to chat up Caliginous Shadow Demon King.

Of course, Caliginous Shadow Demon King asked him why he had not appeared these few millennia. Wu Yu handled them casually, saying that he had been in seclusion, and had finally come out after reaching a bottleneck.

Wu Yu needed to skilfully shift the conversation to Jiu Ying. Luckily, he had the Primitive Demon King's memories, and could speak naturally, nudging the conversation towards news of Fiendish Underworld Metropolis.

"The Fiendish Underworld qi here in Fiendish Underworld Metropolis is truly excellent for cultivation. If I could cultivate here, I would definitely improve much faster." Wu Yu sighed regretfully.

Caliginous Shadow Demon King laughed. "Didn't you profess dislike for being bonded or commanded by others? It's not impossible that you could come to Fiendish Underworld Metropolis if you wanted. However, you would have to adhere by the Diabolical Dragon King's instructions. And truthfully, I'm at the outer area of Fiendish Underworld Metropolis, and the Fiendish Underworld qi is not that dense here. There is a core area in Fiendish Underworld Metropolis where the Fiendish Underworld qi is truly strong, called Underworld Dragon's Den. Cultivating there would be more than 10 times faster than my humble peak."

"Oh right, I also heard that Diabolical Dragon King adopted a son? Jiu Ying or some such. That guy just ascended to the Demon Immortal Realm? As an adopted son, he must be able to cultivate in Underworld Dragon's Den. Envy that guy." Wu Yu finally managed to turn the topic.

Hearing Jiu Ying's name, Caliginous Shadow Demon King shook his head. "I hear that he has a noble bloodline and great talent. It's said that Diabolical Dragon King is grooming him as his successor, and might even be groomed to become an eternal demon emperor. Of course, none of us have seen this Jiu Ying before. Perhaps only the demon kings of Underworld Dragon's Den would know. To enter Underworld Dragon's Den to cultivate, one has to be at least a 5-heavens demon king."

"5-heavens demon king? That means even you can't enter Underworld Dragon's Den, my brother?" Wu Yu feigned indignation.

This was information not in Primitive Demon King's memories, because he had not studied the situation of Fiendish Underworld Metropolis closely before this.

"That's right. Only 5-heavens demon kings and above can proceed into Fiendish Underworld Metropolis to cultivate. Within Fiendish Underworld Metropolis, all who cultivate within Underworld Dragon's Den are important people. There are more than thirty 5-heavens demon kings, nine 6-heavens demon kings, and three 7-heavens demon kings. Finally, the Diabolical Dragon King presides over them all. These fifty or so demon kings are the only ones authorized to remain in Underworld Dragon's Den."

Caliginous Shadow Demon King said a little wistfully. He felt on the verge of a breakthrough recently, but ultimately still lacked that final push of understanding. Therefore, he could not reach the fifth tier. Otherwise, he too could go to Underworld Dragon's Den to cultivate.

However, Caliginous Shadow Demon King was in no hurry. After all, he had a long lifespan ahead of him. One day he would be able to go to Underworld Dragon's Den, and then he too would be someone important in Fiendish Underworld Metropolis.

Caliginous Shadow Demon King felt that as long as he could enter Underworld Dragon's Den, he would be an equal with the "wild" 6-heavens demon kings like Primitive Demon King. After all, he had the great Diabolical Dragon King himself as a backer.

Wu Yu pressed the topic, asking hurriedly: "Even you, brother, you've never seen Jiu Ying? He wouldn't be a fake, would it? Perhaps no such person exists?"

"No one can really tell, but he probably exists. Otherwise, the Diabolical Dragon King would not let the news spread. When this Jiu Ying appears, he will probably be quite a mover and shaker."

Caliginous Shadow Demon King sighed a little enviously. This Jiu Ying, with his rare bloodline and Diabolical Dragon King's favor, would definitely rise to greatness.

Next, Wu Yu exchanged a few more pleasantries, and then prepared to leave.

From Caliginous Shadow Demon King, Wu Yu had learned much that Primitive Demon King had not known. For example, that Underworld Dragon's Den was the core area of the Fiendish Underworld Metropolis. Only 5-heavens demon kings and above could enter, and that the Fiendish Underworld qi was of the highest quality within. It was said to be the fastest place for cultivation in the whole of the Demon Immortal Realm.

And Caliginous Shadow Demon King had also spoken of ways to enter Underworld Dragon's Den.

For example, if one wished to enter Underworld Dragon's Den, one would have to appeal to the Diabolical Dragon King, and also present an "entry gift". Each year, one would also have to offer contributions, in exchange for the protection and usage of the Fiendish Underworld qi.

Of course, these contributions and the entry gift were rather pricey for the demon kings, and it would cut their pockets deep to give such precious things to Diabolical Dragon King. However, they were willing to fork it over in exchange for the finest cultivation conditions. Besides, Diabolical Dragon King himself would also protect them. An occasional fee, and an occasional errand for the Diabolical Dragon King - what was there to complain about, really?

Therefore, Wu Yu decided to head for Underworld Dragon's Den after parting from Caliginous Shadow Demon King. He would see if he could enter Underworld Dragon's Den. As for the entry gift and other contributions, Wu Yu had plenty of wealth.

Before, he had killed many 6-heavens demon kings. Whether it was Primordial Forbidden Demon King, Dreary Gold Demon King, or Golden Rhino Demon King, all of them had many goodies, and his wealth had swelled. Wu Yu had no worry for ever lacking resources in the Demon Immortal Realm now.

Caliginous Shadow Demon King was supportive of Wu Yu's decision. If Primitive Demon King could enter Fiendish Underworld Metropolis, then it would become a stronger place. Besides, Caliginous Shadow Demon King did not currently have a close relationship with any of the demon kings in Underworld Dragon's Den, and it was hard to conduct some of his affairs.

If Primitive Demon King entered, then he would have someone on the inside to help and ease his business.

Of course, Caliginous Shadow Demon King was still a little worried, and he warned Wu Yu before he left: "The last time, the mighty Diabolical Dragon King himself asked you, and you did not agree. Now that you've changed your mind, he might still nurse a bit of a grudge. However, if you show enough sincerity and bring a little more in your entry gift, the Diabolical Dragon King should not make too much trouble for you."

Caliginous Shadow Demon King was indeed quite chummy with Primitive Demon King. Therefore, he naturally hoped that they could stand on the same side.

However, Wu Yu considered this for a while, and then shook his head. "I had best wait a while then. Maybe the Diabolical Dragon King is still a little hot-headed. My request might well be denied. I had better wait for his mood to get better before I petition to enter Underworld Dragon's Den."

"That's a wise choice too."

Caliginous Shadow Demon King smiled and nodded. However, he warned him: "When you're in Fiendish Underworld Metropolis, don't do anything suspicious. If you anger the Diabolical Dragon King, it's not going to be fun."

Caliginous Shadow Demon King also knew Primitive Demon King's character and propensity for trouble.

"Don't worry. I know how to handle myself. I might have been a bit foolish in the past, but now I've reached a bottleneck in cultivation. If I can't enter Underworld Dragon's Den, I might be stuck without a breakthrough for a long time." Wu Yu offered this reason.

That reassured Caliginous Shadow Demon King. After all, a cultivation bottleneck was serious enough that he judged Primitive Demon King capable of behaving himself.

For those with the chance to rise to eternal demon emperor, anything was possible. They would do anything, pursue any chance in order to ascend. They would not bungle things where their eternal life was concerned.

Cultivating within Underworld Dragon's Den indeed gave one a better chance of rising to eternal demon emperor.

And thus Wu Yu parted from Caliginous Shadow Demon King.

Since Caliginous Shadow Demon King did not know any more details of Jiu Ying, then there was no need to linger. After Wu Yu left the peak, he did not rush to act. Instead, he listened and watched within Fiendish Underworld Metropolis, to see if he could get any more information about Jiu Ying.

While within Fiendish Underworld Metropolis, he continued to move in the identity of Primitive Gold Devouring Rat. Neither did he actively seek out information on Jiu Ying, but instead dawdled and eavesdropped into the conversations of other demon immortals and demon kings. Indeed, he sometimes heard Jiu Ying mentioned.

However, most of those conversations ended up fruitless.

In the next few years, Wu Yu did not manage to learn anything. Even if there was a conversation about Jiu Ying, the information was largely limited to what Caliginous Shadow Demon King knew, and perhaps even less reliable.

In these few years, his idling in Fiendish Underworld Metropolis had come up empty-handed. Therefore, he decided to try entering Underworld Dragon's Den.

He decided to try as Primitive Demon King.

"The Diabolical Dragon King will probably grant my entry? Although he might have invited me and been refused previously, but changing my mind should be reasonable." Wu Yu thought. Next, he headed for the core of Fiendish Underworld Metropolis.

In the guise of Primitive Demon King, he shouted loudly from outside Underworld Dragon's Den.

"High and mighty Diabolical Dragon King, I, Primitive Demon King, wish to enter Underworld Dragon's Den. I will work on behalf of the Diabolical Dragon King. I sincerely ask for your permission!"

Wu Yu continued to holler as Primitive Demon King. Many of the demon kings around threw him looks and even taunts, reminding him of his previous refusal and his fickleness, insinuating about his petty character.

Wu Yu had indeed heard many calls about his despicable character in Fiendish Underworld Metropolis.

But in the end they were directed at Primitive Demon King, and not Wu Yu, who could not be bothered with them.

He continued to holler before Underworld Dragon's Den. He was sure that Diabolical Dragon King would very quickly here him and give him a response.