To be the best leader, you must also be the strongest leader!

The Sea Serpent King and his companions said nothing and followed him into a spacious room, where Sun Yi and the others were already waiting.

"Greetings, Sect Leader Sun, and greetings, fellow Daoists." The demon kings quickly bowed.

Sun Yi nodded, then pointed to the ten specially made cultivation spaces lined up in front of him and said, "These are top-notch cultivation spaces that our sect has specially tailored for you."

"The maximum boost effect can reach thirty times. The cultivation resources inside are the demonic power that we have purified, which comes from the demons imprisoned in the Demon Locking Tower."

"The maximum cultivation effect can be three thousand times that outside. You can also use these cultivation spaces to comprehend various laws, which will greatly help your cultivation."

"The cultivation effect can be three thousand times that of the outside world!" The eleven fifth-order demon kings present were stunned by this statement.

They had used the cultivation space before, which shows how powerful it is. However, the cultivation space they used before was far less terrifying than this one.

"One of you stay outside to handle clan affairs, the rest of you go into the cultivation space and make the most of your time to cultivate."

"It will take some time to prepare for strengthening your bloodline. You will go in and cultivate for a while first. After you come out, I will arrange for you to enter the Weapon Refining Hall and the Array Formation Hall for further study."

"Yes, Sect Leader Sun, we will follow your orders." The Sea Serpent King replied respectfully.

The other demon kings also looked respectful, their eyes filled with anticipation. In the end, a fifth-tier demon king from the mermaid clan was left outside to handle matters concerning the four major demon clans, while the other demon kings entered the cultivation space directly through the teleportation array outside.

As soon as the Sea Serpent King entered the cultivation space, he immediately sensed that the surrounding area was filled with extremely pure demonic energy, the purity of which far exceeded the demonic energy he cultivated himself.

Furthermore, the demonic power surrounding him has no attributes or laws, and is extremely gentle.

The Sea Serpent King attempted to devour a portion of it for refinement, only to discover that the refinement process was extremely fast.

He quickly sat down cross-legged in the cultivation space and began to absorb and refine the pure demonic energy around him, while also fully activating the booster device.

With the Sea Serpent King's powerful physique, it could barely withstand thirty times the pressure.

Cultivating in such an environment, the Sea Serpent King clearly felt his cultivation level rapidly improving.

With the help of Sun Yi and the others, he had previously advanced to the early stage of the fifth rank. However, once he reached the early stage of the fifth rank, he needed to spend some time consolidating his realm, and the difficulty of subsequent cultivation was also greater.

So even though the Sea Serpent King didn't slack off, it was still some distance from the mid-stage of the fifth rank.

Under these extreme training conditions, he could clearly feel his cultivation level rapidly improving. Even though his cultivation speed wasn't fast enough, the Sea Serpent King believed that he only needed a month to reach the mid-stage of the fifth rank.

"The methods of the Qingyun Sect are truly unbelievable. They can even create such heaven-defying treasures. Following the Qingyun Sect is definitely the right choice!"

After muttering something, the Sea Serpent King closed his eyes, focusing on absorbing the pure demonic energy around him to cultivate, while also earnestly comprehending the Law of Fire.

This cultivation space is filled with the power of various laws, but the Sea Serpent King is well aware of the importance of the law of fire to weapon crafting, so he decided to cultivate while trying his best to comprehend the law of fire.

In the other nine cultivation spaces, the Mermaid King and the others were also amazed by the current cultivation environment and all entered a state of full cultivation.

When Sun Yi and his group returned to the main control room, they suddenly received a message that the Golden Flood Dragon Demon King's demonic power had been completely drained and its demonic blood had been extracted to the limit.

"Let's go, it's time to collect the remaining materials from the Golden Flood Dragon Demon King."

"Xia Yun, Ouyang Ming, continue to arrange for the extraction of the next demon king's demon blood and demon power. I have already granted you control of the Demon Locking Tower," Sun Yi instructed Xia Yun and Ouyang Ming, who were not far away.

"Yes, Sect Leader, we'll arrange it immediately." Xia Yun nodded seriously.

"Let's go." Sun Yi waved his hand, and a silver light swept up Zhang Ye and the others, making them disappear from their original spot. When they reappeared, they were already in the space where the Golden Flood Dragon Demon King was.

At this moment, the Golden Flood Dragon Demon King's enormous body lay on the ground, its thick limbs and neck encased in five-element rings, and its body bound by silver rune chains.

The red and green pipes were being extracted from the Golden Flood Dragon Demon King's body and slowly retracting back to the top of the space.

Having had most of its demon blood and all its demon power extracted, the Golden Flood Dragon Demon King was extremely weak at this moment. However, when Sun Yi appeared in this space with Elder Zhang Ye and the others, the Golden Flood Dragon Demon King immediately sensed their arrival.

A pair of demonic eyes suddenly opened, and a venomous gaze fell on Sun Yi and the others who appeared in front of them.

"You damned humans!" A furious roar erupted from the Golden Flood Dragon Demon King, the enormous sound echoing throughout the entire human space.

At the same time, an overwhelming and domineering divine soul power formed a storm that swept towards Sun Yi and his group.

Unfortunately, although the Golden Flood Dragon Demon King's soul power was extremely strong, it did not pose a significant threat to Sun Yi and his companions, since they had all cultivated the Ninth Grade Lotus Platform Technique.

"Even after all this, he still won't behave. His soul power is quite strong. We must speed up the development of the Demon Soul Extraction System." Sun Yi calmly looked at the Golden Flood Dragon Demon King in front of him.

"Sect Leader, the research on the Demon Soul Extraction System is now in your hands." Elder Huo Ling looked at Sun Yi.

"Don't worry, I will do my best." Sun Yi nodded. The demon souls of demon kings at the half-step demon lord realm are top-tier materials for refining Heavenly Soul Liquid. Of course, Sun Yi would want to find a way to utilize these top-tier materials, but he couldn't risk the lives of these demon kings. Therefore, he needed to research the demon soul extraction system.

However, extracting a demon's soul is much more difficult than extracting demon power and blood, and it will take a lot of time to study it.

"What else do you want to do? You bastards! I am a demon king of the noble Golden Dragon Clan, at the half-step demon lord realm! You cannot treat me like this!"

Upon hearing that the other party also intended to extract his demon soul, the Golden Flood Dragon Demon King was both shocked and furious.

"Don't you also like to keep humans as pets and then devour human Nascent Soul stage cultivators to help you cultivate? We're all in the same boat, there's nothing to resent."

"Enough with the nonsense. Don't worry, we will keep our promise and let you live!" Sun Yi stared at the Golden Flood Dragon Demon King, a cruel smile appearing in his eyes.

The Golden Flood Dragon Demon King instinctively sensed something was wrong when Sun Yi stared at him like that. Seeing Sun Yi leading another human Nascent Soul stage cultivator towards him, the Golden Flood Dragon Demon King hurriedly roared in terror, "Don't come any closer!"