As Hu San muttered an incantation, he raised his finger and pointed at the crystal ball several times. The surface of the crystal ball suddenly bloomed with a layer of seven-colored crystal light, which then enveloped Han Li and the others.
After the crystal light flashed slightly, the figures of Han Li and the others disappeared. Even their auras were completely concealed.
"Fellow Daoist Hu San, are you using an illusion technique?" Han Li asked doubtfully.
"You can say that. This layer of crystal light can't touch the Perception Restriction. Otherwise, it will immediately reveal our whereabouts.
We don't have much time, so let's hurry up. "Hu San nodded and urged.
After saying that, they swaggered to the foot of the black city wall under the cover of this layer of crystal light.
Throughout the whole process, they didn't attract the slightest attention from the surroundings. The spirit slave guards just stood there, and there wasn't even a trace of fluctuation in their eyes.
Upon seeing this, Han Li's heart slightly relaxed.
"This should be enough, right?" Hu San asked.
"Wait, I have to arrange it."
As Shi Chuankong spoke, he began to take out array discs and Evil Taking Inkstones, and arranged them on the ground.
"You can use this thing to arrange a formation?
I thought you bought it for the Monster Core. "Han Li was slightly startled when he saw this.
"Arranging a Space Formation is all about the geographical advantage. Of course, it's better to use local materials. In any case, Fellow Daoist Magic Light is here. I'll teach him how to activate it," Shi Chuankong said with a smile.
After saying that, he continued to bury his head in arranging the formation.
Han Li carefully looked at it from the side, and found that the formation Shi Chuankong arranged was very complicated. It was somewhat similar to a teleportation formation, but there were obvious differences. Even with his eyesight, he couldn't see too much about it.
"Brother Shi, are you done?
My Illusion Shadow Crystal won't last long … "After a long while, Hu San urged anxiously.
"Alright, all of you stand inside the formation."
Shi Chuankong inserted the last array disc into the formation, wiped his forehead, and straightened up.
When Han Li and the others heard this, they immediately moved into the formation. It was a small circle, just enough for the five of them to stand in.
"It's not difficult to activate it. In a while, try to restrain your aura as much as possible. I will conceal the fluctuations of the formation on the city wall." Magic Light nodded after listening to Shi Chuankong's method of activating the formation.
Then, he raised a finger and killing intent immediately flowed out from the tip of his finger. Like strands of black smoke, it spun and enveloped all five of them.
Immediately after, a chanting sound came from Magic Light's mouth, and circles of spatial fluctuations immediately appeared from the formation under everyone's feet. However, they were blocked by the black wall of Baleful Qi around them, and not a single one of them leaked out.
"Go." A light shout echoed, and Fox Three's Phantom Crystal Light exploded at the same time.
The silhouettes of the people in the spell formation warped at the same time and disappeared.
On top of the city wall, the eyelids of a Spirit Slave twitched. Sensing something, he looked down at the base of the city wall and saw that there seemed to be a whirlwind there, rolling up the greyish-brown dust on the ground.
He hurriedly released his Divine Sense to sweep over there, but he didn't find the slightest abnormality.
And the formation on the city wall also didn't produce the slightest fluctuation. He shook his head, and his indifferent face no longer showed any expression, and returned to its original appearance.
On the other side, on a greenish-gray brick-paved path, the figures of Han Li and the others emerged. Then, their figures flashed, and they silently flashed toward the city.
Perhaps it was because the Three Realms Alliance was being held, but the Hundred Zang District seemed to be even more deserted. The buildings in the city were generally not tall, and there were only a few towers that looked like blockhouses standing tall, and there were also armored Spirit Slaves stationed on them.
In some of the streets and alleys in the city, teams of patrolling Spirit Slaves could be seen shuttling back and forth, and the leaders of these teams were occasionally comparable to True Immortal cultivators.
"The security in the Hundred Zang District is obviously much tighter, we have to be more careful." Shi Chuankong looked around and said.
"Just now, I paid attention to the situation in the Hundred Zang District. The situation in the Hundred Zang District is quite different from what is marked on the map. The positions of many patrol towers are not marked," Magic Light said in a deep voice.
"This is not strange. This map is most likely the version before the martial law of the entire Asura City. If there are any changes in the city later on, it will naturally not appear on the map. As long as the distribution of the roads in the Hundred Zang District is not wrong," Han Li said, shaking his head.
"There is nothing unusual about the roads. There are three roads to the border of Luosheng District. Two of them lead to the city gate, and the other one leads to a corner tower in the northwest direction," Magic Light said after thinking for a moment.
"Then let's go to the corner tower to take a look. The tower is most likely the same as before, and there are Great Immortal cultivators stationed there," Han Li said after pondering for a moment.
The others had no objection to this.
After discussing, they avoided the patrol towers and patrolling spirit slaves in the city and carefully moved through the Hundred Zang District.
After advancing a certain distance into the Hundred Zang District, not only did the number of patrolling Spirit Slaves not decrease, it had instead increased a little. However, the number of Patrol Towers had also increased by quite a bit, with armored Spirit Slaves constantly patrolling above them.
Everywhere in the Hundred Zang District, there was a sentry every five steps.
Even if Han Li and the others had profound cultivation, under such circumstances, they had no choice but to be 120% vigilant and carefully move forward.
In the blink of an eye, half an hour passed, and the five people finally arrived at the center of the Hundred Zang District. They hid behind a tall building and took a short rest.
Han Li's gaze wandered around, and his eyebrows slightly rose.
He could clearly feel that there was a bone-piercing coldness in the air, and a layer of white frost had faintly condensed on the ground and walls nearby.
No ordinary buildings could be seen in this place. On both sides of the road, there were tall and pitch-black fortress-like buildings. Moreover, they were connected to each other, forming a continuous chain of fortresses.
Several huge chimneys towered out of the chain of fortresses, and billowing gray smoke was gushing out of them from time to time. It seemed like a large-scale workshop.
There were a lot of guards in the vicinity of this chain of fortresses, and from time to time, there would be streaks of light flying in the air, and patrolling all the movements below.
"There are so many guards here. It seems that this chain of buildings is not simple. Perhaps, some secret of the Nine Nether Race is hidden here." Hu San's eyes lit up as he looked at the chain of fortresses in front of him. He then transmitted his voice to the other four people.
"What's inside has nothing to do with us. Our top priority is to find the Evil Cleansing Pond.
Hu San, the current situation is not the same as before. You mustn't complicate matters, "Shi Chuankong's complexion tensed up as he warned.
"I know. You can rest assured," Hu San said with a faint smile.
Shi Chuankong was still somewhat worried. He stared fixedly at Hu San as if he was afraid that he would get into trouble.
Han Li glanced at the two of them. Then, he turned his gaze toward the surrounding black fortresses. With a single thought, he sent a wisp of his divine sense into them.
Just as his divine sense penetrated the walls of the fortresses, it was immediately repelled by an invisible force.
A trace of surprise flashed in Han Li's eyes. He hastily withdrew his divine sense and didn't continue to probe further.
"Boy, do you want to know what's inside?" Shi Qing Hou's voice resounded in Han Li's mind again.
"It seems like you know what's inside?" Han Li's eyebrows rose as he transmitted his voice.
"The Nine Nether Grand Depository Mysterious Restriction is set up in these walls. Although it's a secret restriction of the Nine Nether Race, it's not difficult to break it. I'll teach you the method to break it. Take a look at it yourself," Shi Qing Hou didn't answer Han Li's question.
Then, a wisp of thought was transmitted to Han Li's mind. It was a mysterious method to break the restriction.
Han Li didn't show any joy after receiving the secret method. Instead, he frowned and asked, "Why did you teach me this secret technique? Why do you want me to explore the situation inside?"
However, Shi Qing Hou remained silent once again. It seemed like he didn't intend to reply.
Han Li's expression sank. After a moment of hesitation, he decided to release a wisp of his divine sense and penetrate the wall once again.
An invisible force immediately emerged from the wall and blocked the divine sense's advance.
His eyes flickered as he operated the method to break the restriction.
The originally tough restrictive force quickly became soft. Then, it fused with the power of his divine sense.
Then, with a "poof" sound, his Divine Sense easily penetrated in and saw the situation inside.
Han Li's eyes flickered for a moment. But, he soon recovered.
Inside the fortress, there was a huge pond. It was at least a hundred meters wide. The pond was filled with a greyish-white liquid. At this moment, it seemed to be boiling as it violently churned.
There were four black iron cages immersed in the pond. Two strange beasts from the Dust World were locked inside. There were also two people with bull horns on their heads. It was unknown what race they were.
The two grey beasts let out mournful cries as they struggled in the iron cages. They wanted to break out, but the iron cages were abnormally sturdy and kept the two beasts locked inside.
The other two cow-horned aliens did not struggle or scream. Their bodies seemed to have stiffened as they lay stiffly in the cage. Only their eyes would occasionally move, indicating that they were still alive. However, their expressions were also extremely lifeless.
These two people seemed to have been immersed in the pond for too long. Their bodies had become greyish-white, making them look a bit strange.
Other than that, there were also two Infernal Slaves standing in the pond, closely observing the situation inside.
Han Li was surprised, but he did not look at them anymore. He quickly moved forward and entered the next fortress.
This fortress did not have a pond, but there was a huge furnace. The furnace was burning with surging grey flames, but it did not emit any heat. Instead, it emitted a bone-chilling cold.
Inside the furnace, there were a few greyish-white creatures of the Dust World or Grey Beasts.
Streams of gray light shot out of the furnace and quickly merged into the bodies of these outsiders and gray beasts.
The bodies of these creatures quickly swelled up as if they were inflated with air. Strange patterns appeared on their skin.
Han Li's spiritual sense paused there for a moment before continuing deeper. In the blink of an eye, he had examined over a dozen black fortresses. Each of the fortresses had a unique body refinement technique, such as boiling, burning, or refining with poison.
The Grey Beasts were refined in these fortresses. Their bodies were constantly changing, turning into humanoid and beast-shaped monsters.
These monsters' auras were a lot stronger than before, but they had lost their minds. They had turned into puppets with blank expressions. They were locked in a huge iron cage and piled up in the last fortress.