Entering the stone gate, Wang Yu and the others passed through a dim passage and arrived at an extremely spacious hall.

The hall was dimly lit, with dim yellow oil lamps hanging on both sides of the walls. They burned a milky-white oil, producing no smoke but emitting a faint, sweet and greasy smell.

Wang Yu let out a long breath and glanced at the others, seeing that they all looked relieved as well. He couldn't help but sigh inwardly.

It was no easy feat to escape from the combined efforts of two Da Luo level cultivators. If the restriction had opened a breath or two later, they might have been completely wiped out.

Although they were temporarily safe, the string in his heart did not loosen at all.

They didn't know where this place was. If they weren't forced by the situation, he would never have ventured into such a place. In his opinion, a place that could be called a forbidden area by a large clan mostly had some special meaning, either hiding some cultivation methods, secrets, or treasures, or sealing something.

Previously, Gui Mu and Yin Xu were so nervous about this place, as if they were afraid of destroying the restriction here. Judging from this, the latter was more likely.

The group didn't dare to stay in place for long and immediately began to explore the hall separately.

The entire hall floor was densely covered with layers of overlapping runes, crisscrossing and extremely complex. On the walls on both sides were carved two extremely long stone murals, the scenes of which were quite similar to what they had seen on the palace gate before, mostly bloody scenes of strange beasts fighting.

"Something seems wrong. There's no way forward. We're completely blocked here." Hu San quickly walked to the end of the hall, checked for a moment, and turned around to say.

Wang Yu shifted his gaze and saw that there was no passage leading to the depths at the end of the hall. The entire wall was carved with a relief of a giant beast resembling a human figure, which was exactly the one on the right side of the palace.

However, the giant beast was no longer in the crouching posture as before, but in an upright state. Its legs were not like those of the human race, but somewhat similar to those of deer, with obvious bends in the knee joints, which were covered with huge black scales, and the exterior was surrounded by thick black evil aura.

It was seen that one hand was raised in a claw, with a ball of pitch-black mist condensed in the palm, while the other hand was holding a giant flame sword with a very strange shape, making a roaring gesture towards the sky, and a fierce aura with a primitive atmosphere rushed towards them.

"We were able to break the space restriction outside, but it definitely won't be able to stop them for long." Shi Chuan Kong said with a worried expression, constantly looking around.

"Don't worry, let's figure out what this place is first." Wang Yu said with a slight gaze.

"This seems to be a place for sacrifice. Take a look at the murals here." At this moment, Ti Hun suddenly said.

Everyone looked over quickly and saw that the innermost position on the right wall was indeed carved with a scene similar to the ancient ancestors of the human world, sacrificing to ancient gods.

However, the scene carved here was even more grand and bloody. The sacrificial offerings used were thousands of Gray World creatures, including various Gray World monsters with low spiritual intelligence, as well as civilized races such as the Ci Tuo race, all of which were driven into a giant pit shaped like a "sea bowl".

Outside the pit, the giant beast carved on the wall was lying prostrate. It stretched out half of its body and lay on the edge of the "sea bowl", grinning with a bloody mouth, full of greedy and fierce expressions.

Compared to the Ci Tuo people in the bowl, it could be seen that this beast was very huge, at least a thousand feet in size.

After Wang Yu glanced at the giant pit shaped like a "sea bowl", his brows furrowed, and he took a few steps back, looking towards a strange depression on the ground.

It was seen that the chaotic lines of runes on the ground seemed to be without any rules, but in fact, they were entangled and converged to this depression, which was only a few feet in size and deeply sunken into the ground.

"What's wrong? Did you find something?" Bai Li Yan had suffered a lot of damage before and had been adjusting his breath for a while before he came forward and asked.

"Look at this depression, isn't it a bit like an open-mouthed sea bowl, somewhat similar to the sacrificial pit on the mural?" Wang Yu said after pondering for a moment.

"Now that you mention it, it really is somewhat similar, just countless times smaller. It seems that this is indeed a place for sacrifice… Could that thing on the wall be?" Shi Chuan Kong said after carefully examining it for a moment.

"I'm afraid that thing is sealed here, so this place is called a forbidden area by the Jiu You clan." Wang Yu nodded and said.

"No wonder the Jiu You clan doesn't allow fighting here. They're afraid of destroying the seal here and releasing that thing." Hu San suddenly realized.

"Rumble"

Just then, the ground of the hall suddenly shook violently, and a roar came from outside.

"They have already begun to break the restriction…" Ti Hun said.

"At this point, we have no way out. Since the Jiu You clan is afraid of this giant beast, let's find a way to release it, and perhaps we can gain a glimmer of hope." Wang Yu said after pondering for a moment, his eyes narrowed.

Ti Hun's expression changed slightly when she heard this, and a hint of hesitation flashed in her eyes, but she didn't say anything after all.

"Li kid, I advise you not to do this. I've already remembered what this thing is. Once it's released, not to mention dealing with the pursuers behind you, I'm afraid you'll be the first to suffer." Seeing her expression, just as Wang Yu was about to speak, Shi Qing Hou's voice sounded in his sea of consciousness again.

"You know what it is?" Wang Yu asked in confusion.

"Kun Hou, have you ever heard of it?" Shi Qing Hou transmitted his voice.

"What is that?" Wang Yu was slightly startled, somewhat puzzled.

"Kun Hou is a creature that has existed in the Gray World since the primordial chaos was not opened. It is said to be a monster condensed from the Yin Sha origin of the Gray World. Its strength is monstrous and absolutely invincible. Many races in the Gray World still retain the old custom of sacrificing to it. As for why it was sealed here by the Jiu You clan, I don't know. I'm just reminding you out of good intentions. Ultimately, you still have to make the decision." After Shi Qing Hou finished speaking, there was no more sound.

"Master…" Seeing Wang Yu was somewhat absent-minded, Ti Hun hurriedly called out.

The eyes of the others also looked towards him. Obviously, everyone had gradually become accustomed to accepting his guidance and letting him make decisions.

"At this critical moment of life and death, we can't care about so much. No matter what's below, let's release it first." Wang Yu pondered for a moment and seemed to have made up his mind.

Outside the hall, the roaring sound became more and more intensive. Gui Mu and Yin Xu seemed to be anxious and became more aggressive.

"This restriction is very complicated. If we forcibly destroy it, with our current combat power, I'm afraid we won't have enough time. Let's try to unlock it by arranging formations as much as possible?" Shi Chuan Kong frowned and said.

"Time is of the essence, let's act separately." Wang Yu nodded and agreed with his view.

So the group began to search for the formation nodes and formation hubs.

The purple light in Wang Yu's eyes flashed, and the Nine Nether Demon Eyes were activated, probing towards the altar in front of him.

Under the Demon Eyes, all the details around the sacrificial pit were clearly visible.

Before long, he saw that on the seemingly flat altar, there were actually many earthworm-like lines, densely covering the entire platform. The lines were messy and without any rules. It seemed that they were not any unknown runes. Their depressions were filled with dirt and grime, all kinds of black sludge-like things.

Inside the sacrificial pit, there were also dense lines densely arranged, forming a strange pattern similar to a flame.

Wang Yu checked for a long time and found nothing abnormal. Then he shifted his gaze and continued to check the surrounding murals.

The material of the stone wall was no different from the wall, and he looked at it for a long time without any gain.

"Did you find anything?" Hu San walked back from a corner of the hall and asked.

"There are some lines on the ground, but they seem to be intermittent and disordered. They should just be used for decoration and are not any magic formations or restrictions." Shi Chuan Kong shook his head and said.

Wang Yu looked up at the dome above and saw that there were circles of circular runes carved there, totaling seven layers. Each layer had a string of dense runes imprinted on it, and in the center was an inverted black cylinder.

"Take a look above." Wang Yu's heart moved and he reminded them.

Everyone heard this and looked up.

"This seems to be a space restriction formation…" Shi Chuan Kong said, feeling a bright light in front of him.

"Brother Shi, do you recognize this?" Hu San asked.

Shi Chuan Kong didn't speak. His brows were knotted together, as if he was lost in thought. After a moment, he slowly opened his mouth and said:

"This restriction is divided into two parts, heaven and earth. From the overall layout, it has some similarities with the Qiankun Jin You Great Formation of our Demon World. And from the pattern of the formation on top, it overlaps with many of the space-based runes recorded in the Gray World Magic Formation Secret Canon that I checked before. It should be a similar formation in the Gray World."

"Is there anything that can be learned from?" Wang Yu asked.

"I'm not too sure. Although there are some similarities, the differences are also very obvious. There are many fire-based lines in this restriction formation, and I don't understand what they are for." Shi Chuan Kong hesitated.

As he was speaking, there was another loud noise outside, and everyone's feet trembled with it.

"There's no time to guess. You can try it first. If it doesn't work… we'll wait for Yin Xu and the others to break the formation and come in. Then we'll fight to the death and try to use their power to destroy the seal here." Wang Yu said with unusual calmness.

"Okay! Then please listen to my dispatch for the time being and help arrange it." Shi Chuan Kong nodded solemnly.

Everyone responded quickly, took pieces of Ji Sha Inkstone and formation disks from Shi Chuan Kong's hand, and began to arrange them on the ground of the entire hall according to his command.

After the ground was covered with black stones, he ordered everyone to start embedding them on the top of the dome.

In the entire hall, in addition to Shi Chuan Kong's simple instructions and the sound of everyone's rapid footsteps, there was only the roaring sound coming from outside. The atmosphere was extremely oppressive.

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