From the Abyss Invasion to the Blasting Star.

Chapter 364: Skeletons of Creatures Under the Blue Hole
After making sufficient preparations, Lu Heng led the recruiting team to Wugulan Cave.

In order to facilitate the operation, they borrowed a boat from the Sirens before setting off.

High Priest Sona borrowed the largest ship in the tribe and sent a team of Siren warriors to accompany it.

The ship sailed for more than 700 kilometers and gradually approached the Ugulan Cave.

Lu Heng and Su Muyu first flew into the sky, flew around the Wugu Blue Cave, and overlooked the Wugu Blue Cave from the sky.

Just as Celian described, looking down from the sky, the Wugu Blue Hole is a huge blue round hole.

The outer circle of the round hole is blue, and the color becomes darker towards the center, turning directly into ink-black in the center.

Wugulan Cave is very large with a diameter of more than ten kilometers.

Moreover, there are many underwater caves inside, crisscrossing each other, and the internal structure is very complex.

After flying around, Lu Heng asked Su Muyu to release the Chongming Bird, which entered stealth mode and flew into the Wugulan Cave for reconnaissance.

Afterwards, the two returned to the boat and asked the captain of the Siren tribe to drive the ship to patrol the outskirts of the Ugulan Cave.

When he came, Lu Heng promised Sona that he would not let the ship and the Siren crew on board be in danger.

Therefore, the ship will patrol the waters 30 kilometers away from Wugulan Cave.

Even 30 kilometers away from the Wugulan Cave, there are many cases of encountering black-scaled demons.

After Jiang Shaoran discovers the black-scaled demon through his ocean perception ability, he will arrange actions according to the situation.

There are two purposes for coming to Wugulan Cave this time. The first is to scout Wugulan Cave, and the second is to expand the benefits of the Abyss Battlefield.

Since we want to expand the benefits of the Abyss Battlefield, we need to hunt demons as much as possible to help all team members improve their source energy levels.

Therefore, as long as the black-scale demon is discovered and the enemy situation is scouted, Liu Haiyang will lead a team to dive into the seabed to hunt it down.

Since Lu Heng can only exert 30% of his combat power in the sea, he would not waste that energy. As long as Liu Haiyang and the others were not in danger, he would stay on the boat.

This time, Lu Heng came to explore the Wugu Blue Cave, in addition to expanding profits, he actually had another purpose.

Because there is an important information in the memory, but it has not been found yet.

In the previous life, during the first recruitment of the Siren World, a fourth-level source essence appeared.

The first recruitment of the Sirens occurred one and a half years after the Abyss descended upon Blue Star. The fourth-level source essence was very rare at this time point.

After all, the recruiting rules of the world will evaluate the combat effectiveness of the psychics and then teleport them to the world with the corresponding danger level.

The resource level and danger level of the Abyss Battlefield are directly proportional. The higher the danger level, the more high-level resources will appear.

The fourth level of source quality can only appear in a world with a danger level of 7, and it is only possible, not inevitable.

Lu Heng was interested in this fourth-level source essence, but he didn't know much information about it. He only knew that it was a fourth-level source essence from this world, but he didn't know where it came from.

After all, the information about the abyss world is of very high value and cannot be made public casually.

Moreover, this fourth-level source essence is a bit strange. It is not the fourth-level source essence of the ocean system.

When Lu Heng went to the Dark Iron Dwarf Kingdom before, he also tried to find relevant clues, but found nothing.

There was no sign of the fourth level of source essence in the Sirens’ territory.

Lu Heng asked Sona for the map because he also wanted to see if there were other places in the world where the fourth-level source essence might exist.

After looking around, the most likely possibility is the Black Bone Blue Cave where the Black Scale Demon lives.

However, the internal structure of this Black Blue Cave is complex, and it is too dangerous to rush in and search for it.

Just in time, the team needs to expand its gains on the battlefield, so they can explore the Black Bone Blue Cave to see if there is any possibility of finding clues to the fourth-level source essence.

Liu Haiyang led the team to hunt black-scale demons on the seabed, clearing out the enemies along the way and gaining a lot.

Su Muyu sat by the side of the boat, closed his eyes and controlled the Chongming Bird to fly into the Wugulan Cave to explore.

After the Chongming bird entered the water, its speed decreased a lot and it was not as free as when it was flying in the sky.

She closed her eyes and said as she explored: "There are many large and small underwater caves in the blue cave. There are black-scaled demons in some of the caves..."

She did not let the double-headed bird get close to the black-scaled demon in the cave. After all, her mission was to explore the Black Bone Blue Cave and she had to avoid being discovered by the demon as much as possible.

Lu Heng listened to her report and prompted: "Look towards the center of the blue hole."

"it is good."

Su Muyu nodded in agreement and controlled the Chongming Bird to slowly approach the center of the blue hole.

When she was two kilometers away from the center, she took a deep breath and said, "I saw the ocean cemetery that Celian mentioned. There are many skeletons of marine creatures floating within a range of about two kilometers from the center of the Ugulan Cave.

"These bones rotate counterclockwise around a central point, and the speed of rotation is so slow that it cannot be distinguished without careful observation.

"The bones of these marine creatures are all black. Now I understand why the color of the center of the Wugu Blue Hole is so dark. It is the base color formed by the skeletons of these marine creatures."

Looking down from the sky, the skeletons of these marine creatures float in the sea, stacked up layer by layer to form a black background.

When Lu Heng heard this, his brows furrowed slightly.

Because this situation is really weird.

In the ocean cemetery with a diameter of two kilometers, countless biological skeletons rotate around the center of the Ugu Blue Hole, just like a planet revolving around it.

This situation is obviously abnormal. There must be something in the Wugulan Cave, and it must be something very scary.

At this time, Su Muyu suddenly said: "No, the skeletons are not all marine creatures, there are also land creatures. I saw the skeletons of obvious land creatures, with limbs and claws."

Although some marine creatures have limbs and claws, it is still easy to distinguish the skeletons of marine creatures and those of land creatures.

Combining this information, it is clear that there is something special beneath the Wugulan Cave.

But this thing has appeared in Wugulan for at least several decades and has not spread outward. Why is that?
Is this thing alive or dead?

If this thing is alive, and has existed for decades, is it possible that it has never come out to move around?
If it had come out, the Sirens should have noticed it.

If it has never come out, is it a dead thing?
Lu Heng tried hard to recall and find relevant information from his memory, but he found nothing.

After the emergence of the Siren World, the number of marine-related mutants among humans will gradually increase, and more and more people will be recruited to the Siren World in the future.

Therefore, humans will no longer be unfamiliar with the Sirens world, and more and more recruits will bring back information and intelligence about the Sirens.

However, there is no secret about the Ugur Blue Cave in this information. Why not?

Judging from the strange phenomena now showing in the Wugulan Cave, there must be something underneath.

If there is a terrifying demon king similar to the fire demon Gross here, it will inevitably cause a crisis.

Every time the Abyss Battlefield is called up, it is because of a crisis, and the cause of the crisis is the source of Abyss pollution.

In other words, if the "thing" under the Wugulan Hole is a source of abyss pollution, there will definitely be conscription missions in the future to specifically deal with this source of abyss pollution.

If there is a call-up, information will definitely come out.

Since there is no information about this "thing" in the Ugur Blue Cave in the memory, it is highly likely that there was no call to action.

Could it be that the things inside have nothing to do with the abyss?
However, with so many biological skeletons surrounding it and black-scaled demons living on the periphery, does this environment really have nothing to do with the abyss?

This information combined makes the matter even more bizarre.

Lu Heng thought and reminded: "Be careful, slowly approach the center of the blue hole and see what's on the seabed."

"Okay." Su Muyu nodded in agreement and continued to control the Chongming Bird, passing through the skeleton area and slowly approaching the center of the Wugu Blue Cave.

As she explored, she reported what she saw: "It's strange. After entering the skeleton area, I didn't see the black-scaled demon anymore."

The Black Bone Blue Cave is indeed the habitat of the Black Scale Demon. Logically speaking, this should be the territory of the Black Scale Demon.

"Is there not a single black-scale demon?" Lu Heng asked again.

"Yes, there is not a single one. I have already carefully investigated. The closer you are to the skeleton area, the fewer black-scaled demons appear. After entering the skeleton area, there is not a single black-scaled demon."

Su Muyu was thinking while answering, and analyzed: "I think the black-scaled demon will not approach the skeleton area at all, because the skeletons of the creatures here are floating quietly in the water.

“If a black-scaled demon comes in and touches these skeletons, the floating direction of the skeletons will definitely change, and the arrangement of the skeletons will become very messy.

“However, the skeletons of the creatures here are just floating quietly, and even the entire skeleton area is very quiet.

"There's another strange thing. Theoretically, the density of bones is greater than that of water, so they should sink to the bottom of the sea. The floating situation is very unusual."

Normally, bones have a high density and should sink to the bottom of the sea.

Even if there are bones with a lower density than seawater, they should float to the surface of the sea instead of floating in the sea.

This situation of neither sinking nor floating could be caused by the density of bones being similar to that of seawater.

If this happens to a single animal's skeleton occasionally, it can be considered a special case, but if all the animal's skeletons float up, there must be a special reason.

Lu Heng listened to Su Muyu's report and became more and more curious. He reminded: "Be careful, find a way to see what is under the blue hole?"

Su Muyu nodded and agreed: "Okay, I'm curious too."

As the Chongming bird slowly approached the center of the blue hole, its forward speed became slower and slower.

It was not because of any resistance, but because it was to avoid touching the skeletons of those creatures.

Since there were obviously problems with the skeletons of these creatures, in order to avoid unnecessary trouble, Su Muyu controlled the Chongming Bird as much as possible, avoided the skeletons, and drilled towards the center of the blue hole little by little.

However, the closer you get to the center of the blue hole, the greater the density of biological skeletons.

Su Muyu held her breath and concentrated on controlling the Chongming Bird while reporting the situation: "We are now about 500 meters away from the center, and the density of the skeletons is getting higher and higher.

“I don’t dare touch those creature skeletons, so I have to slowly find a way to get through.

“When we were outside the skeleton area, the skeletons of these creatures were still intact, and we could see the general appearance of the creatures when they were alive.

"By the time they were within 500 meters, the skeletons were basically incomplete. They were broken into pieces of bones, still floating in the sea water, rotating counterclockwise around the center at a very slow speed."

As Lu Heng listened, he could imagine the scene in his mind. He reached out and pressed her shoulder, and asked, "Are you scared?"

"A little bit." Su Muyu pursed her lips and revealed a warm smile.

When she projected her consciousness onto the double-headed bird, it felt like she had personally entered the ocean cemetery and was alone in the area of ​​bones.

This feeling is actually quite scary.

When Lu Heng put his hand on her shoulder, she felt a little warmth. The feeling of having someone she trusted by her side immediately dispelled her fear.

"But it's okay, I'm not afraid." Su Muyu said this, but her hand involuntarily hugged Lu Heng's arm, and she continued to close her eyes and control the Chongming Bird.

As the Chongming Bird gets closer and closer to the center.

Su Muyu's heartbeat was also slowly accelerating. When it approached the center, she was stunned for a moment and said:

"I may have seen something under the Black Blue Cave, but..."

"But what?" Lu Heng frowned slightly, feeling like he was being kept in suspense.

Su Muyu went on to explain: "The Chongming Bird has entered the center of the blue hole. When it reaches the bottom, it can already see the rocks on the seabed.

"There is a pile of bones gathered together on the seabed. The diameter is about 30 meters. They are piled up into a square area, like a cube, but you can't see what's underneath the bones."

When Lu Heng heard this, he became even more confused and asked, "Can we get into this pile of bones?"

Su Muyu shook his head: "No, this pile of bones is densely packed together, there is no gap to get in, unless you launch an attack and shake these bones apart."

There is a pile of square bones under the Wugulan Cave. There must be something in it, and it is most likely something very scary.

The question now is, do we want to see clearly what is underneath?
Moreover, even if you want to see it, you may not be able to see it.

After thinking carefully, Lu Heng said, "Let's see if we can move the bones."

"Okay, I'll try." Su Muyu nodded in agreement, then controlled the Chongming bird to stretch out its claws to move the bones.

The next moment, her body trembled, she suddenly opened her eyes, and gasped, "I lost the connection with the Chongming Bird."

Lu Heng reached out and patted her back and asked, "Are you okay?"

Su Muyu waved her hand and replied, "I'm fine, I just have a little mental backlash, it's not a big problem."

Lu Heng then asked: "What happened just now?"

Su Muyu recalled and explained: "Actually, I'm not too sure. As soon as the Chongming Bird came into contact with the pair of square bones, I instantly lost the connection with the Chongming Bird. I don't know what happened exactly."

(End of this chapter)