However, if the two of them don't hand over 3,000 demon cores within three days, then Wu Feiyun will be locked up in their black prison. It's just that I don't know what a black prison is.

"Little brother, do you know what a black prison is?" the little Taoist priest asked.

If there is no danger in the black prison, the two of them will not take that risk. Don't you listen to this little brother, what kind of shadowless demon ape can even kill the god cultivator, so he eats the brain marrow, and the mulberry fire is only the Yuan Infant Great Perfection, so naturally there is no holy calculation.

When the young man heard this, he was shocked. Under his introduction, I knew a little that the black prison was a dark place. Everyone who came out of the black prison was basically insane. Of course, there are some who are cured, but, without exception, they all forget what happened in the black prison.

The two of them were in a dilemma. If you are insane, then what is the point of living? However, if you really kill monsters and take demon cores here, there is great danger.

However, if you use another method, you can also give it a try. The little Taoist priest thought about it, but decided to stay first.

Seeing that they insisted on staying, the boy sighed and walked out of the cave. The two found that there were really not many people in the complex and huge underground cavern. It seems that it was really like what Xiao Nian said, he was scared away. And those few people basically have the realm of transforming into gods.

Here, the most are rat demons, from the ground to the ground for five thousand meters, that is, ten miles, all of which are only in the condensation period. Ten to fifty miles underground, there is a large number of foundation building periods. And fifty to one hundred miles underground, there are already a lot of rat demons in the Jindan period, and there are some in the Yuan Infant stage. As for the hundred miles below, it is not very clear. However, if the two of them only take the demon core in this ten to fifty miles place, there should be no problem.

On these 50 miles alone, there are no less than 20,000 rat demons! This is a lot to be done.

Isn't it the rat demon? The little Taoist priest and the mulberry fire went ten miles underground and arrived at an open place. Along the way, they easily dealt with more than a dozen rat demons and two black fire snake demons. The demon cores in their bodies are all dark red, but the shape is a little different. The Rat Demon's core is spherical, while the Snake Demon's core is diamond-shaped.

This open land has nearly 10,000 square meters, and after they exterminated the seven or eight rat demons here, they laid a ban. The next step is to bring in the demon rats.

The little Taoist turned his hand over, took out a jade talisman, and with a burst of mana, the jade talisman turned into a weasel. The weasel was so smelly that Sang Huo pinched his nose and hurriedly walked out five or six meters. But the little Taoist priest didn't do that, he took out a stinky charm and slapped it on the weasel, and in an instant, the smell on the weasel was several times stronger.

"Wow~" Sang Huo squatted on the ground and vomited. This couldn't help but make the little Taoist priest roll his eyes for a while: Hmph, you are still a Yuan Infant Dacheng, isn't it just a little smelly, as for it?

"This," Sang Huo felt the little Taoist's gaze, and scratched his head embarrassedly, "I, I faint weasel smell......"

An object in the little Taoist's hand flew towards him, it was a deodorizing charm, and when Sang Huo slapped it on his body, he felt that the smell was gone. He sniffed around like a dog, and not only the stench of weasel was gone, but even the smell of rats that permeated the air was gone.

"Hehe, Brother Lu, your talisman is really good!\ There is a little fairy fire in it, and he is an opportunity to comprehend and sublimate. As long as you comprehend a trace of the law of immortal fire, it is a rank holy fire!

However, to their disappointment, this place was too far away from the Little Immortal Fire, and the power of the law and true intent was too weak to be mastered. It would be nice if it could go down two hundred miles. Alas, what a pity!

On the afternoon of the third day, the beautiful woman in black arrived in front of the crater. The little Taoist priest handed over the six thousand demon cores to her, and said unhappily: "Didn't you say that you want us to breed spirit beasts, how can you just leave us in this place where birds don't?"

"You take this demon core to feed the spirit beast, so the more demon core you get, the more secure the food of the spirit beast, and the healthier it will be. Wu Feiyun said, "It seems that you are mixing well here, then you will continue to hunt demon beasts here, this mission is still 3,000 per person, I will give you five days, but this time, what I want is a demon crystal, you can enjoy the joy of hunting!"

What, Demon Crystal? Listen to her, this Demon Crystal is not a Demon Core. It seems that it should be more advanced!

Sure enough, when the mulberry fire reached fifty meters below, he killed a rat demon in the foundation building period, and what was taken out of it was no longer a demon core, but a demon crystal. The Demon Core is similar to the Demon Crystal, but it is different. The demon core is dark red, while the demon crystal is pure red, and at a glance, you can see that the demon crystal is much more advanced than the demon core.

It seems that Wu Feiyun is forcing them down to the next level! The reason why he didn't let them go down all at once was to shirk their responsibilities, and at the same time, he hoped that they would be devoured by the shadowless demon ape on the first layer. If this is the case, the three elders blamed it, and she also said that it should be the safest to let them hunt beasts in the first layer, but she didn't expect that there would be so much danger. It's just that the first layer didn't do anything to them, so they could only force them to the second layer.

However, even so, there should be no danger on the second layer. The one that is in danger is the fourth layer. This is still separated by the third layer, what are they afraid of, and they also want to go down to the next layer to further comprehend the law of immortal fire. Although the Immortal Fire is different from the Suzaku Fire, each of them has something in common. Just like a house, there are all kinds of things, but the basic framework is pretty much the same.

As before, they first found a wide field of land, and then slowly waited for the rabbits. Everything went smoothly at first, and in three days, they hunted five thousand demon crystals. However, on the fourth day, something changed.

No matter how coquettish the upgraded weasel may be, and the stench of seduction, the rat demons of the foundation period will no longer follow its ass to die. This made the little Taoist frown deeply, so quickly let those rat demons understand their methods? However, it is clear that these rat demons in the foundation building period have no wisdom!

Just as frustrated as a fisherman who cast his net several times and didn't have a single fish, the little Taoist priest changed places a few times, but there was still no more catch. Not only that, but he also found that he had been able to encounter one or two rat demons in the passage for a long time, but now he didn't even find one. What is going on? It's the Black Fire Serpent Demon, they've killed a dozen.

This made the little Taoist puzzled, how could it be so quiet, as if those rat demons had moved. Although the demon crystal of this black fire snake demon also counts the same, however, this black fire snake demon is different from the fire rat demon. The Black Fire Snake Demon likes to act alone, while the Rat Demon is a social animal, and if you catch a large group, it will be much more efficient.

The Black Fire Snake Demon also doesn't like sports, they like to dig a hole to hide, and they don't like to go out except for hunger. The little Taoist priest also used the scent method to trap and kill the black fire snake demon, but it was not ideal at all. Because they do not distinguish things with their noses, but with their tongues, which are snake letters.

Therefore, they have been looking for only a few dozen for a long time, and at this rate, it is impossible to obtain six thousand demon crystals, according to the remaining time.

On the fifth day, as they crossed a fork in the road, Na Sanhuo's expression suddenly changed: because when he released his divine sense to search for the Black Fire Serpent Demon, he found a surprising scene......