Digging to a depth of 40,000 meters underground, Qin Shu finally discovered that there was a huge rock at the foot of his location, at first he thought it was just a chance encounter, and dug towards the side of the boulder, wanting to bypass him and continue to dig down.

After digging hundreds of meters to the side, he was very puzzled.

The boulders are very large and hundreds of times harder than other rocks, and when excavated, they are also the materials needed to build megacities.

"Forget it, let's break the rock and dig a passage. Qin Shu gave up the idea of wanting to take a detour, no matter how hard this huge rock was, it was still opened a gap.

It was so big that it went down hundreds of meters and still didn't reach the end, with this kind of hard rock on both sides.

Qin Shu didn't believe in this evil and continued to dig, and he didn't know how long it had been, the ground under his feet suddenly collapsed, and his whole body fell downward.

He reacted immediately, and a pair of wings of light appeared behind him, and a brilliant light erupted from his raised hand, illuminating the space.

It's too big to imagine a place like this deep underground.

At a glance, it looks like a cave where a strong man retreats, like an underground palace, exuding vicissitudes and grandeur.

All kinds of utensils made of rocks are covered with a thick layer of dust, and on both sides of the rock-paved road, the creatures of the Light Clan are carved from jade, as if they are greeting, maintaining a posture of kneeling and worshipping.

Qin Shu looked at the environment here, and after scanning around, he confirmed that there was no danger, and then landed.

He walked along the road, looking for a glimmer of life.

In this tomb, there is a coffin inlaid with an eternity-level demon consumption coffin, and if you find it, it is equivalent to finding your own glimmer of life.

He sent out his buddies to help find them.

At the end of the road was a very large stone gate, closed and beside it were two carved unicorns, staring ahead as if they were looking at him.

I don't know if there is an unknown danger here, Qin Shu doesn't dare to take risks, even if it takes a long time, it's nothing.

In the end, the poisonous devouring flying ants he controlled searched every corner near the stone gate, and after there was no danger when he went, Qin Shu stepped forward, walked in front of the stone gate, and slowly pushed the door in.

Behind the stone gate, there is a huge space, including the foot, and on the wall next to it, there are patterns depicted, some of which are even blurred, and the picture is not clear.

It took some more time to search for whether the cluster was in danger, and then Qin Shu continued to move forward.

There is not much to discover, it is like a labyrinth, extending in all directions, and there are many stone artifacts placed in each space.

At this moment, the pet beast that Qin Shu released seemed to have discovered something, and it transmitted an emotional fluctuation.

He immediately rushed in that direction, and it didn't take long for him to see a large coffin, placed in an open space, and the surface was inlaid with dense eternity-level demon cores.

Seeing this picture, Qin Shu suddenly became nervous, and his heartbeat involuntarily accelerated, this is what he has been looking for, and he finally found it.

But whether there is danger or not, you have to try, everything must be careful, one is not careful, and the price will be paid for life.

A group of spiders composed of machines were released by him from the pet beast space, and these are the products of the cyborgs, which are just used as white rats for experimentation.

I saw these mechanical spiders approaching the coffin, and then climbed onto it, trying to pry the eternity-level demon core embedded in the surface.

Soon after, an eternity-level demon core fell on Lin.

Qin Shu still didn't dare to be careless, and let you be a mechanical spider and bring back this eternity-level demon core.

"It seems that not all tombs are dangerous. Qin Shu breathed a sigh of relief, originally thought that coming here would more or less trigger some dangers, but from beginning to end, things went very smoothly.

More eternity-level demon cores fell to the ground, and after a while, Qin Shu's hand had an extra handful of crystal clear eternity-level.

He had a smile on his face, and the system could be upgraded again.

As for what will change after that, it is still unknown, and he always looks forward to it.

About a stick of incense passed, and all the demon cores were removed from the coffin by the mechanical spider.

There are more than a hundred of them, and they exude a white glow.

"100 Eternal Demon Cores have been detected, and the system upgrade conditions have been met, will they be upgraded?"

The familiar voice echoed in his mind again, Qin Shu missed the appearance of this voice very much, so he naturally did not hesitate at the moment and chose to upgrade.

In the pet beast space, those eternal-level demon cores that were put into it by themselves were swallowed by a black hole that suddenly appeared, and then it was as if nothing had happened.

Qin Shu held his breath and waited for another voice in his head.

The changes brought about by this upgrade, he had already guessed some, first, the space of the pet beast was expanded by 10 times, and the demon beasts that could be fused should also have reached the realm master level, and then there were the divine beast eggs and the contract scroll.

Whether there are any other new changes is still unknown, but it will be revealed soon.

The so-called very fast, Qin Shu waited for half a stick of incense time, and there was still no sound of successful upgrade from the system.

He couldn't help frowning, and thought about it, maybe this upgrade was different from the previous times, after all, what was needed to upgrade the system was not an ordinary demon core, but an eternal level.

While waiting, Qin Shu's gaze was more on the coffin.

What kind of existence is it, to be able to have such treatment, it must have been very powerful in life.

Although I want to know, he is not the kind of person who disrespects the deceased, and he will definitely not be able to do such a thing as opening the lid of the coffin.

At this moment, a familiar voice finally came from his mind.

Qin Shu couldn't wait to see the changes after the system upgrade.

Pet Fusion System

Level: 10 (100 Realm Master Cores required to upgrade.) ）

Level 10 Pet Fusion Technique: Gather 5 realm master-level demon beasts, fuse them with pet beasts, and evolve into chaos-level.

Level 9 pet space: 10 billion cubic meters.

Level 7 Pet Beast Healing Space: Consume demon cores and heal any demon beast injuries.

Level 5 pet beast fixed-point teleportation: Even if the pet beast is far away from the owner's location, it can also be teleported to the pet beast through the two, and the owner will teleport to the pet beast, with a cooldown time of three.

Infinite Contract Scrolls: The lowest bronze level of the contract, the highest immortal level of the monster, the contract scroll system is infinitely available.

"The system upgrade is successful, and ten Eternal level contract scrolls will be rewarded. ”

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