Since Zhuang Yinli has promised to get enlightenment tea for Huan Yin, and Luo Hu has not yet left the customs, according to the information that Huan Yin currently has, I am afraid that within more than a month, he will have nothing to do except go to find "Heavenly Machine" and "Future" through Nayu Ruyi.

In this way, coupled with the fact that Huan Yin was really interested in the secret hidden behind Yu Ruyi, he even guessed that even if Ruyi was in hand, it would not be easy to obtain that mysterious existence, so he simply followed what Zhuang Yinli said, and seized the time to find out through Yu Ruyi.

According to Zhuang Yinli, as long as Huan Yin poured spiritual power into Jade Ruyi, he could sense the direction of that mysterious existence. Huan Yin did just that, so under some sense, he broke up with Zhuang Yinli, and after leaving the cave, he flew all the way towards the center of Shanxian City.

The direction that Huan Yin sensed was an area in the center of the entire Shanxian City. It took him more than half a day to finally arrive near the destination, and with a slight surprise, he hurriedly lurked.

This is the central area of the city, but it is not the absolute center. Here, it is the periphery of the central area. Surrounded by mountains, there are no gorgeous buildings and dense crowds, this is the place where the good people of the entire Central Shanxian City talk about the color change, and it is also a forbidden area that normal people are unwilling to set foot in - this is the Central Shanxian City Heavenly Prison!

At the time of Huan Yin's reign, the prison already existed. In the past, there were also prisoners here, but there were not many of them. Because the people who can be imprisoned here are all Heavenly Realm monks who are famous for their crimes and crimes, and there are even fierce beasts that have opened their minds.

However, now this place is different from the past, the number of prisoners here has increased significantly, and those who have increased are basically the people of the Heavenly Dao. These Heavenly Dao people have not done evil, but they may be supporters of Huan Yin, or former ministers of Huan Yin, or they may be people who oppose Rahu. They all have some value in them, and they haven't been dug up yet, and Rahu can't kill them, so they are locked up here.

Here, Rahu sent a strong army to garrison, which was also suppressed. At the same time, there are people who specialize in torture here to torture prisoners day and night, until they confess, then give them a bitter pleasure and send them to hell.

In the past, it was a prison, a place where evil was suppressed. And now, it is even more privately called the "black prison" by the people of Tiandao, and the jailers and defenders here are themselves evil, and the people who are imprisoned are often good people.

Huan Yin really couldn't imagine why Yu Ruyi would lead him here, could it be that the door that Yu Ruyi was going to open was in this prison?

After hesitating for a long time, Huan Yin finally decided to leave. Although he knew that this prison was extremely well guarded, and it was extremely likely that he would break in and be discovered, he would not back down because of this.

Of course, you can't break in. Before poisoning Rahu, Huan Yin must keep an absolute low profile in all his actions. So, he dressed himself in a tight-fitting black garment and walked with his face covered.

Huan Yin reined in all the breath in his body, and also activated the power of all the treasures on his body that could cover the breath. This, coupled with the fact that the black-clad suit he was wearing had a similar effect, he felt that if he was careful, he might be able to sneak in.

Who would have thought that this infiltration would take him five days.

During the five days, Huan Yin always maintained absolute caution, hiding from sentry posts, avoiding patrols, and passing by crises again and again. In several of them, he could only move when the guards were changing, so he waited for half a day.

During the whole process, Huan Yin fully saw the strength of the guards here, and he was simply scared all the way. And he dared to guarantee that if he was really discovered, the guards here would gather and easily kill him. Also, the formation here is extremely terrifying, even if he wants to run, he may not have a chance.

In addition to the crisis, Huan Yin also saw many people. Among them, the Heavenly Dao naturally accounted for the vast majority. And there is no shortage of old people and old ministers of Huan Yin, who are all imprisoned here.

Seeing the old man, Huan Yin couldn't help but sigh. However, he has always controlled his emotions well, knowing that he can't save them now, let alone show up. So, he just quietly glanced at it, and then left.

Fortunately, in the end, Huan Yin finally succeeded. The thrill of the five days is needless to say, only he knows. And at this moment, he was already standing in front of a long corridor.

This is the lowest level of the entire prison, and it is also the heaviest prisoner. However, Huan Yin didn't remember that there was such a corridor at the end of this layer, and this corridor seemed to have been newly opened by someone.

After evading the guards, Huan Yin cautiously stepped into the corridor. The road sloped downward, so Huan Yin walked all the way, and it turned out to be all the way down, towards the deeper underground.

From beginning to end, Huan Yin used jade Ruyi to sense. So he knew early on that what Yu Ruyi was pointing to was the bottom of the heavenly prison. It's just that he didn't expect that he had unconsciously followed the guidance to such a deep underground. He was even more puzzled, isn't the prison a place where sin is imprisoned, and there should be a great evil at the bottom of the prison, at least for Rahu.

So, at the other end of this road leading to the depths, is there a heinous existence for Rahu?

The corridor was pitch black, with no lights, and it was even cut off from the investigation of the divine sense. Huan Yin came all the way, like a blind man, and he could only be cautious all the time. He didn't know if it was because he was walking too slowly or because the road was too long, so he walked for a long, long time.

Fortunately, Huan Yin never encountered guards along the way, and it was obviously a no-man's land, so he had been safe and sound.

The more he walked, the more certain Huan Yin was that this road was built later. He even had a feeling that this road seemed to be deliberately built for a certain existence. This existence may be the secret hidden by Yu Ruyi, and it is also the biggest target of the entire Heavenly Prison.

It's just that Huan Yin doesn't understand, why hasn't any guards been arranged here? Is it that Rahu is afraid that an outsider has approached the secret of the underground and knows the truth? Or is there an unprecedented fierce spirit underground, and there is no point for someone here, and the only way to suppress it is to use the entire heavenly prison to suppress it?

In this way, Huan Yin finally came to the end of the road. And so, a light appeared in his eyes, an ordinary fire, as if there was an everlasting lamp lit there.

Huan Yin stood at the Yongdao crossing and observed for a long time, but did not immediately appear in the light. However, he still didn't see any guards, and he didn't feel the slightest abnormality.

It's just that the more this happens, the more nervous he becomes. He wouldn't believe that Rahu had nothing to do, so carefully built a secret room, and connected it with such a long passage that isolated the divine sense, and used the entire heavenly prison to suppress it, just for an empty stone room.

There may be unknown evil spirits hidden here, terrifying evil beasts, and terrifying crimes that can be killed in an instant.

However, no matter how much speculation there was, Huan Yin finally observed repeatedly in the Yongdao for nearly half a day, but there was still no gain. In the end, his heart was crossed, and he still walked from darkness to light.

Nothing out of the ordinary, Huan Yin looked around and saw that it seemed to be just an ordinary stone room. On all sides of the stone wall, there are everlasting lamps on the stone walls, and the shadows of the lamps flicker in the beating firelight.

After making sure that he was safe, Huan Yin cautiously walked around the entire stone room. The walls of the stone chamber are still isolated from divine sense detection, and the effect is extremely strong, and Huan Yin's divine sense cannot penetrate at all. However, this is the only discovery that Huan Yin has made. Others, as if there was nothing left here.

Huan Yin took out the jade Ruyi, and the spiritual power was infused into it, and with a slight sense, the whole person was suddenly shocked, and Ruyi almost fell off his hand. He looked at the stone wall to the south of him, and he felt an extremely strong impact through Yu Ruyi, and it was obvious that the secret behind Yu Ruyi was behind this wall!

"There's something wrong with this wall!" Huan Yin was not stupid, and immediately thought of the key. The wall on the south side seems to be the same as the other three sides, and it is also isolated from the divine sense, but as long as Yu Ruyi is right, then it must also be a secret door, behind it, there may be some mystery hidden!

Huan Yin picked up the jade Ruyi and walked towards this wall!