After punishing Kunpeng Demon King, and ascertaining that Green Fire Demon King was not coming back, Diabolical Dragon King proceeded to announce the matter.

"Right now in Underworld Dragon's Den, we must build an Ancient Demon Dragon Perpetual Devourer immortal design. Fashioning this immortal design will require the help of many. Each of you must be responsible for your part, and I will brief you on your individual tasks later!"

Following Diabolical Dragon King's announcement, the demon kings were all confused. Ancient Demon Dragon Perpetual Devourer immortal design?

They had never heard of this immortal design before, and it sounded pretty sinister. It didn't sound like an immortal design. More like a demon design. And they had no idea how they would do it as well.

Besides, each of them would have to take charge of one part, personally assigned by the Diabolical Dragon King himself. He was evidently keeping them in the dark as to the purpose of the design. If each of them only focused on one part, it would be hard for them to discover the overall effect.

Diabolical Dragon King had split the immortal design into about 50 different parts!

All of the demon kings of Underworld Dragon's Den would have to take one part each. In this way, the immortal design would be completed more quickly. If Diabolical Dragon King undertook this alone, then he could ensure that there were no mistakes. However, he would trade off speed for quality.

Dividing it into 50 different portions for the demon kings would not increase the speed correspondingly by 40 to 50 times. However, he could still expect a 20 to 30 times boost. This was quite a lot, and clearly speed was of the essence for Diabolical Dragon King now.

Wu Yu's suspicions were growing by the moment. What on earth was the purpose of the Ancient Demon Dragon Perpetual Devourer immortal design?

And it seemed like Diabolical Dragon King was in a hurry to complete it, all the while keeping the demon kings in the dark as to its purpose! All of the demon kings present must be burning with curiosity, but at the same time afraid to ask. Diabolical Dragon King clearly would not tell them.

But this only made them all the more curious.

Some of the demon kings were even suspecting that the Ancient Demon Dragon Perpetual Devourer immortal design might harm them. Could it be that the Diabolical Dragon King wanted to use them somehow, and it was through this secretive immortal design?

The demon kings all felt a little anxious. It felt like a slave being made to count the change for his own purchase.

As for Wu Yu, he had a biting feeling that this Ancient Demon Dragon Perpetual Devourer immortal design might just have something to do with Jiu Ying. It was ridiculous - Jiu Ying looked too pathetic right now to pass as the Diabolical Dragon King's adopted son.

One could even call Jiu Ying a puppet. He seemed to have lost sentience, and no one knew what was up with him.

The other demon kings of Underworld Dragon's Den had come across Jiu Ying like that from the start, and did not think too much of it.

But for Wu Yu, it was definitely abnormal.

Ancient Demon Dragon Perpetual Devourer immortal design was undoubtedly part of this whole sticky mess, and something to do with Jiu Ying.

But neither Wu Yu nor the other demon kings could voice the suspicions in their heart. They could only give them rein within the freedom of their private thoughts. Of course, the other demon kings were thinking that the chances of this immortal design harming them was rather low. Therefore they were more curious than fearful.

"Such an elite great void immortal design will be a simple task with each of you playing your parts. Kunpeng, come here."

Diabolical Dragon King beckoned to the gravely injured Kunpeng Demon King. Wu Yu hurried over. He was probably about to receive the details on the great void immortal design.

Diabolical Dragon King would definitely personally oversee the main portion. He had also just told them that the task would take a few years to complete with so many demon kings helping.

If it were just Diabolical Dragon King alone, he would take a few centuries, even if his creating speed was much faster than the other demon kings.

Very soon, Wu Yu knew the role that he had been assigned.

Because he had killed Green Fire Demon King, Diabolical Dragon King had assigned him Green Fire Demon King's part as well. Which meant that Wu Yu alone had to do the work of two demon kings.

Very quickly, Diabolical Dragon King had informed the other demon kings of their respective duties.

Finally, he informed them grimly: "Whoever is tardy in completing their task will be cast out of Underworld Dragon's Den!"

This definitely made clear Diabolical Dragon King's prioritization of this great void immortal design!

Anyone who was found cutting corners or slacking off would be cast out of Underworld Dragon's Den. This was no laughing matter. For many of the demon kings, this was as serious as punishments got.

They were the demon kings of Underworld Dragon's Den, and the other wandering demon kings did not dare to cross them.

But if they were cast out of Underworld Dragon's Den...... all the demon kings with grudges would come knocking.

The good news was that the other demon kings knew that Kunpeng Demon King had been assigned a double share, including Green Fire Demon King's work. This meant that he could not possibly complete the immortal design that quickly.

The other demon kings breathed a sigh of relief. With Kunpeng Demon King around, they could not possibly fall behind. Even if they lagged a little, they would not be in last place. This was comforting.

However, the pressure was still on. They could all see how important this immortal design was to Diabolical Dragon King. Any mistake might even result in their own death.

Therefore, all of the demon kings were on their toes. They did not dare to slack off, but followed Diabolical Dragon King's instructions to the tee, hurrying off to their respective locations in Underworld Dragon's Den.

Each of them was in charge of a different zone. Underworld Dragon's Den was huge, and they might very well not see any other demon king for the next few years as they buried themselves in their work.

Before the demon kings split up, Wu Yu carefully scanned their faces. It seemed that none of the demon kings knew what the immortal design was for. But perhaps the three 7-heavens demon kings would know more.

After all, the other demon kings up till the 6-heavens demon kings all looked bewildered and uneasy, even a little nervous.

Whereas the three 7-heavens demon kings showed impassive stoicism. They should already be in the know.

Clearly, the other demon kings might just be lackeys, but the true core of the Diabolical Dragon King's forces were these three lieutenants. Only they three had the Diabolical Dragon King's trust.

Or perhaps Diabolical Dragon King had judged that they were capable enough, and had entrusted them with much.

Regardless, it was a question that Wu Yu had to consider now. Should he really follow the Diabolical Dragon King's instructions and complete both duties?

If the Ancient Demon Dragon Perpetual Devourer immortal design was truly used to deal with Jiu Ying, then wouldn't his best efforts contrarily harm Jiu Ying?

The good news was that the immortal design was a long ways away from completion. In this time, Wu Yu could still assess the situation and see if there was any useful news.

Most important of all was to get close to the three 7-heavens demon kings.

But as the just-punished Kunpeng Demon King, he was almost certainly doomed for the slowest completion and subsequently cast out of Underworld Dragon's Den. Would the three 7-heavens demon kings even talk to him?

It did not seem very likely. If he asked them directly, they would definitely not answer. It would only call the Diabolical Dragon King's attention to him, and the consequences would be doubled.

As the others left, Wu Yu started to sweat a little. He should already have left by now. It did not seem like any opportunity was going to present itself.

Finally, Diabolical Dragon King shot a parting shot of warning at Kunpeng Demon King, and then left as well.

Wu Yu was left in charge of a huge area, the work of two demon kings awaiting him. Wu Yu was pretty sure that he could not just quietly comply with the immortal design's building.

It might very well harm Jiu Ying.

Seeing Diabolical Dragon King lead the blank Jiu Ying away, Wu Yu's suspicions were at the tip of his tongue now. The situation was not looking good.

"Forget it. One step at a time. Maybe something will present itself after a few days."

Wu Yu thought. He began to pretend working on the immortal design.

The entire Underworld Dragon's Den was shrouded in a tense atmosphere. Not just Wu Yu, but the other demon kings as well - virtually everyone in Underworld Dragon's Den had been mobilized, and even Diabolical Dragon King and the three 7-heavens demon kings were personally putting their backs into the labors as well.

This had never been heard of before. Many of the demon kings suspected that something big was on the horizon.

No one knew what the Ancient Demon Dragon Perpetual Devourer immortal design was for. Each person handled their task, quietly working on their own section. Through the details of their section, they could not puzzle out anything.

Or perhaps it was used to defend the Underworld Dragon's Den?

Many demon kings were wondering about this. Ordinarily, immortal designs were used defensively. This Ancient Demon Dragon Perpetual Devourer immortal design was slated to cover the entire Underworld Dragon's Den. It was plausibly a defensive design.

And yet many demon kings remained curious. After all these years, the Underworld Dragon's Den had never been attacked before. To suddenly build such a powerful defensive immortal design seemed a strange decision at best.

Of course, the demon kings were all in all pretty relaxed, besides a smidgen of worry that the great void immortal design was designed to harm them. They all immersed themselves in their work.

After all, when the immortal design was completed in a few years, they would know what it was for.

Only Wu Yu remained anxious in the whole of Underworld Dragon's Den. This might well concern Jiu Ying!