"Boss, are you sure this passage can go directly behind the Demon Fortress?"

The bull bowed his waist and asked as he walked through the passage full of hanging stone pillars.

It took them hours to reach into a mountain range on the left side of the Black Heath, and then they plunged headlong into the middle of the mountain, where they found a cave hidden by tree branches at the foot of a mountain.

The cave was not an underground passage they had seen before, but a small cave of about two meters leading straight underground, and the cave was full of stone pillars as sharp as teeth sticking out from above or below, and if they were not careful, they would cut their clothes.

To be honest, if it weren't for the sword that cut off a few stone pillars, they would have thought they had come to the body of some monster.

It is very inconvenient to move around in it, because if you are not careful, you will hit a sharp stone pillar, and if you have too much force, it is easy to scratch.

But there is no way, the place where they walked above is already very close to the Demon Fortress, even if they are invisible all the way, they can't guarantee safety, and the patrols of the Demon Fortress that they encounter from time to time here are all equipped with Demon Hounds, this kind of Demon Nose is very smart, and it is easy to find their traces.

The strength of the Demon Fortress is beyond their imagination, just every patrol team outside has hundreds of demons, and the leader must be the small boss of the boss template, they will not be able to kill it for a while, and it will soon attract other demon teams, after two attempts, he simply gave up and honestly climbed the hole here.

Fortunately, they are not easy to walk in this cave, and the demons are not easy to walk, there are no monsters in it, only a small number of insects that are eroded by the demonic breath and demonized, which are easily killed by them.

After stumbling through the cave for an unknown amount of time, the terrain also started from the bottom to the top, several ups and downs in a row, and sneaked through a flooded passage, and finally reached the destination, under the cliff behind the demon fortress.

The passage was drilled out from under the cliff, and the stones blocked at the entrance of the cave were pushed away, and a group of four people got out.

"It's so corrupted here!"

At a glance, both the stones and trees under the cliff are all black, and the ground is still exuding a trace of black gas, and the entire stone wall is black, and there is a faint tingling sensation when the hand presses on it.

Obviously, under the influence of the Demon Fortress's hundreds of thousands of demons, this place has been completely corrupted, even if the trees that grow have been demonized since birth.

There is no demon patrol team here, it is estimated that it is a misunderstanding of ordinary people's thinking, at most there are guards on the cliff, and there will be no patrol team under the cliff, which is convenient for them.

Ye Qing gathered the team members together and said:

"Wait a minute, first send the dark extinction up to investigate the situation on the edge of the cliff, and then find a dead corner for me to go up, this time we are first touching the situation in the fortress and not fighting, so you and Xiao Yu are waiting below."

The two of them didn't say anything, even the wild bull, obviously knowing that it was too dangerous up there.

After a brief discussion, he blessed Darkness with a flying technique and a light body technique, and asked him to go up first.

The flying technique allows him to fly, and the light body technique allows him to easily climb against the stone wall, so as not to consume too much strength.

When the figure of the Darkness disappeared, he pulled the two of them to hide in the cave that he had drilled out before, so that no demons would pass by and see it.

After waiting for almost an hour, the team channel came with a dark response, and Ye Qing came out of the cave, made a reassuring gesture to the two, and rose up in the air.

Through the positioning in the team channel, Ye Qing flew diagonally to the left for a distance of almost a kilometer, and then slowly rose, and the safe blind spot found by the dark annihilation was here.

Just as he climbed the cliff, the Demon Fortress ushered in a team of patrolling demons back to the fortress, but no one noticed, one of the demon teams looked strange, constantly looking around, but the amplitude was very small, and his appearance was a pure demon image, but no other demons noticed.

The demon left the group after returning to the barracks and began to wander around.

"It's a good place, and there are usually no demons coming."

Ye Qing squatted in the gap behind several boulders piled together on the edge of the cliff, this was a safe place for the dark annihilation, one side was the cliff and the other was the stone, as long as there was no movement, there would definitely be no demons to investigate.

After a short rest, he blessed himself with a light body technique, a stealth technique, and touched it out one after the other.

Needless to say, the stealth technique is to reduce the footprints, he is not as good at stealth as the dark annihilation, if he doesn't have the light body technique, his footwork is easy to leave a subtle sound and be discovered.

Most of the demons guarding are Dark Hunters, and the little demons like the Sinking Demon are too active and noisy to be suitable for guarding, and most of the time they are used as cannon fodder.

Of course, it's not completely nothing, just now Ye Qing saw a group of Sinking Demons in front of his eyes, and he didn't know what they were doing.

Demons also have their own social composition, although most of the time is killing, but they still have their own social composition, even the lowest-level Sinking Demons, their biggest hobby is not to gather around to cook broth, but... Fight.

That's right, demons are aggressive by nature, and even if there are no enemies, there are often fights within themselves, and this is when a fight is needed to solve it.

The group of Shen Lun demons in front of him formed a circle, holding maces in their hands and constantly smashing the ground and making strange screams, and in the center were two sinking demons that were stronger than their kind in size.

They didn't fight with their bare hands, but picked up the mace full of spikes and beckoned to the opponent's head, the two sunken demons were already full of cuts, the demon's blood flowed all over, and one of the heads was about to open, and a hole was poked out by the mace spikes, and some strange liquid flowed out of it.

The two of them bypassed the group of fanatical sunken demons who were watching the excitement without attracting attention, and climbed up the ridge on the side.

From here, you can see the whole picture of the Demon Fortress, the Demon Fortress is built at the junction of the Black Wasteland and the Taimo Heights, the whole fortress is leaning on the steeply rising highlands, divided into two parts, one part is still in the Black Wasteland, and the other part is on the Taimo Heights, with a huge drop.

The lower part is a huge military camp, the rough demon buildings are connected for more than ten kilometers, Ye Qing is now on the edge of the Taimo Heights, from top to bottom you can see the dense demon figures in the barracks, it is difficult to estimate the specific number, but it is certain that the total number exceeds 100,000.

The upper part of the building style is relatively refined, the towers emitting black smoke go straight into the sky, like a volcano, a large amount of black smoke gathers together to form a thick layer of black clouds above to cover the entire fortress, from time to time I see a black figure hovering between the pillars of smoke, just because the distance is too far to see what kind of flying demon it is, but it is certainly not a foul-smelling crow.

It is estimated that there are some demons with identities living on the Demon Fortress, such as some small bosses and the like, and Bisu Bosu must be in it.

The two looked at each other for a while, and then asked darkly:

"How do we get close?"

He rubbed his fingers against his chin and didn't answer for a moment.

There are so many demons that there are no dead ends without special guards, and the huge number of demons that flow all the time can take care of the entire fortress itself, and it is even more difficult to touch it than to ascend to the sky.

It's just that even if it's more difficult than ascending to the sky, they have to find a way to complete this task, and it's not impossible.

It's still the old way, digging holes.

That's right, you can't touch it from the front, and you can't fly into the sky, so you can only make a surprise move and dig it into the ground with fossils as mud.

He told the Darkness the way, but the Darkness had no opinion, it was the only way.

He immediately turned around and jumped down from the same way back to the edge of the cliff, and the Darkness stayed on it, and he wanted to start digging from the closest place to the fortress Bisu Hirosu's residence, and the Darkness stayed on it to locate him, in case he fainted if he dug in the wrong place.

Flying down again, he found Manniu and Mi Xiaoyu, this time the two of them wanted to help, Manniu was responsible for doing coolie digging, and Mi Xiaoyu was responsible for sentry outside.

The place they chose was a cliff, there was no demon patrol above, it was a dead end, it was impossible to climb up from here under normal circumstances, let Mi Xiaoyu find a place not far from the stone wall to hide and sentry, Ye Qing took the bull to lie on the edge of the stone wall, stretched out his palm, and there was a layer of spiritual light surrounding.

When the palm of the hand was pressed on the stone wall, the spiritual light spread and spread on the stone wall, and the hard stone immediately began to soften, like wet and soft soil, and a large piece could be pulled out with a single hand.

The hardness of the fossil is controllable, and he can be directly turned into the softest and can be dug out with the least force.

The bull took out a whiteboard two-handed sword and sank into the handle, and when he stirred the hilt in the mud, he dug out a large piece of soft mud, and dug out a large pit with a diameter of more than one meter in a few clicks.

After digging a cave of nearly three meters in a few strokes, Ye Qing walked to the end of the cave, stretched out his hand again, turned the hard stone inside into soft mud again, and withdrew from the wild bull to continue digging.

As the two of them dug forward, he recalled the terrain he had seen before, and dug into the interior of the fortress from memory, occasionally reorienting himself with the dark contact hidden on it, so as not to make a mistake.

It took them almost three hours to dig a hole almost a kilometer long with this stupid method, which is nothing short of a miracle.

If you dig here, you will basically enter the inside of the fortress, and if you dig up from here, you can enter the upper part of the fortress.

But Ye Qing is not satisfied, this is only the periphery of the fortress, and it is still far from the place where Bisu Bosu is, and it will take at least half a day to dig.

Fortunately, they have enough time, and this place will not be discovered by the demons, let alone heard by the demons, the hard stone turns into soft mud, there can be no big movement, unless it is dug under their feet, it is impossible to find it.

The two of them rested for a moment and continued to dig forward, ready to dig to their destination in one go.

While they were in the local rats, a roar suddenly sounded from above the monastery deep in the Taymour Heights:

"Damn, it's a trap, get out!"