The Heihe area is an absolutely forbidden area in Fengdu City.

No undead spirit can cross the Black River, even powerful ones like the three overlords and ghost angels are no exception.

The territory of Fengdu City is very vast, bigger than the stars, but the Black River is even wider, completely covering the entire Fengdu City. It can be said that the main reason why the undead cannot leave Fengdu City is that this area completely envelops Fengdu City.

The Black River is included.

The previous Qin Feng was also extradited to Fengdu City through this Black River. The guide gave her a pair of shoes at the end. This was his final trump card in Fengdu City, more important than the Moon Eclipse Fan and the Tongyin Order.

.

He always felt that this pair of shoes might eventually become his most important thing and might help him the most.

However, now was not the time to touch on the shoes. He just kept the shoes. So far, no one knew about the shoes, not even Su Rao or even the Demon Snake.

Now, Qin Feng was approaching the Heihe River. Looking at the majestic Heihe River, he couldn't help but feel something in his heart.

"The black river has no beginning and no tail. It is impossible to distinguish between the upper reaches and the lower reaches. It does not know whether to return or to end. It surrounds the entire city of Fengdu like a cage!"

"Sometimes, I doubt that Fengdu City is the real place of reincarnation. There will always be annihilation of dead souls, and there will always be dead souls entering it. It has no beginning and no end, and it is an eternal cycle!"

He muttered to himself, sighing at the horror of this black river, but then he shook his head and thought no more.

"Well, it's useless to think too much. My purpose is for the Black River water. It's not my turn to think about these long-lasting things now!"

He returned his attention to the Black River.

There are many substances hidden in the Black River water, and the insulating potion was refined by him from the substances separated from the Black River water.

But there is another substance that is more critical. This substance contains a power that can break the law of cause and effect, which is very terrifying.

Qin Feng ventured into the Phantom Scorpion territory to find the Poison Corpse Flower because of this.

At this moment, everything was ready, so he naturally took action. He stopped here and used the white jade bottle of suet to get the water from the Black River. Then, with the help of the devil snake, he successfully mixed the water from the Black River with the various substances contained in it.

The particles of matter are separated.

One of the devil snake's greatest strengths is separation.

After separating these substances, Qin Feng sifted them to retain the particulate matter that contained the causal part, and then gathered the energy into a cauldron, putting all the particulate matter and the poisonous corpse flower into it for refining.

As a result, he failed.

In three days, he used many methods to refine it, but he was still unable to refine the corresponding medicine.

He has considered all the dosage issues, refining time issues, flame issues, and even space issues, and has made many attempts, but in the end he has achieved nothing.

Once those material particles enter the cauldron and are refined for a while, they will completely melt and finally turn into a burst of mist and disperse.

"What went wrong?"

Qin Feng frowned. With his current level of alchemy, it stands to reason that he would not be unable to refine it. There must be something wrong with some process.

"Is it possible that there is a problem with these material particles themselves?"

But in the end, he rejected the idea.

At this time, Qinglian suddenly reminded: "It may not be that there is something wrong with your refining method. I think it is possible that something went wrong during the separation stage!"

Demon Snake frowned and his tone became a little cold: "Are you saying there is something wrong with my level?"

"Who knows?"

Qinglian said coldly, it was not false at all.

"There must be no problem with alchemy. In that case, the problem must be with someone."

"Who knows if someone is incompetent, or if someone has some evil intentions, and wants to separate the causal substances in it through separation, so as to resolve the causal laws in his body!"

The Demon Snake immediately became angry and said angrily: "Since you said that, why don't you separate the black river water and the substances in it later? I don't want to do such a thankless task!"

"I'll come, I'll come, aren't you afraid?"

Qinglian said in a deep voice, quite feeling the urge to replace the devil snake and separate the black river water by herself.

She didn't believe that the devil snake could separate the substances in the black river water, but she couldn't separate them! Qin Feng was helpless, why were these two quarreling again?

Are their natures incompatible?

But at this time, he had no time to pay attention to the two of them, and had already devoted himself to the next round of refining, using some new methods.

"Rubbish!"

"waste!"

“That’s bullshit!”

"A useless vase!"

Qin Feng's ignorance naturally caused the mutual hostility between the two to continue, and Qin Feng finally couldn't bear it anymore.

"What are you arguing about? If you have this time, why not help me figure out what the problem is!"

"snort!"

Qinglian snorted again, expressing her dissatisfaction.

Qin Feng was helpless and a little strange at the same time.

Qinglian seems to be particularly hostile to the Demonic Snake, and the Demonic Snake is not a temperamental person and cannot be submissive. As a result, the two often quarrel.

But why Qinglian is so hostile to the demon snake, Qin Feng is a little strange. He can feel Qinglian's thoughts, but it is impossible to sense her inner feelings.

But right now, he didn't bother to think too much. The water of the Black River was the key.

"It failed again. I have tried various methods. The problem should not be with the refining. Perhaps, there is indeed a problem with the separation process!"

Qin Feng said solemnly, but immediately he made up for it: "It's not that there is something wrong with your separation method, senior, but it is possible that if this thing is separated from the Black River water, problems may arise, such as,

Loss of strength?”

"It's possible!"

The demon snake responded, but did not deny it.

Because it is indeed possible.

"How about I leave some fire aura when we separate next time and wrap it around the granular matter of cause and effect to prevent its power from flowing away!"

Qin Feng nodded and agreed.

So, the Demonic Snake began another process of separating the black river water. On top of the previous method, it added another step, using flames to wrap all the particles in it, and the sparks were dotted, making it look gorgeous.

Then, Qin Feng mixed these granular substances with the Poison Corpse Flower and started the refining process in the cauldron.

This time the process took longer than before, because he could feel that the power of the granular substances in the cauldron had not passed away, and the poisonous corpse flower began to slowly integrate into it, and finally gradually exerted its medicinal properties, and the two were completely combined.

Together, they form a purple potion with compelling medicinal properties and the power to resolve the laws of cause and effect.

"It's done!"

Qin Feng was overjoyed.
Chapter completed!