Cheng Yang walked around the underground city, and indeed encountered some orcs sporadically, I don't know if they stayed to watch the house, or they were too timid to rush out to die. Anyway, none of them escaped the fate of being killed now, and they all died under Cheng Yang's attack.

It took Cheng Yang two hours to completely kill all the orcs in the underground city.

He was standing on the inner wall of the underground city, and it was like a deep abyss, dark and swarthy, with no end in sight.

Although Cheng Yang had been to the underground city several times, he had only wandered around the city every time and had not paid much attention to the situation outside. Now that he's killed all the orcs in the city, he finally has the leisure to look around the dungeon.

Of course, the most important thing is that Cheng Yang did not find anything in this underground city that was enough to attract his attention, all the buildings here were just ordinary buildings, and they did not have any attributes given by the rules of heaven and earth.

In addition, Cheng Yang did not see a very important thing from here, where did the orcs come from.

Based on such a long time of groping in the apocalypse, Cheng Yang can be regarded as having a lot of experience. Since these orcs all came to Earth from another world, they should not appear without any basis, and there must be some traces.

If Cheng Yang's sense of orientation is not bad, then this underground city should be located in the north of the entrance to the underground world.

In other words, the passage to the entrance to the underground world is to the south of the underground city, and on the east and west sides of the underground city, there are solid stone walls.

In the far east, although most of the place is also a stone wall, there is a deep passage that leads to the distance.

Cheng Yang had a hunch in his heart that as long as he entered that passage, he would be able to find out the secret of the orcs coming to this world.

Cheng Yang took a deep breath. With a leap of action, he jumped off the wall and walked with a determined stride towards the passage.

As Cheng Yang entered the passage, the light suddenly dimmed. In the area of the dungeon before, the entire space seemed brighter due to the fluorescent flickering on the cave walls. But there is no such good thing in this passage. The walls of the cave are all pitch-black stones, not to mention automatic glow, even if there is any light, it will be absorbed when it hits it.

Cheng Yang concentrated and observed the movements around him. At the same time, he took out a night pearl from the storage ring, and immediately lit up the surroundings.

This night pearl was made by Cheng Yang from the abandoned land before, and he never had a chance to use it, but now it has finally come in handy.

After turning a few corners, Cheng Yang almost walked a kilometer or two. Suddenly, I saw a dead light in front of me.

Cheng Yang's heart tightened, not because he was nervous, but because the answer to the doubts in his heart was finally going to be answered.

Cheng Yang couldn't help but take a few quick steps, and suddenly there was a huge cave in front of him.

Compared to the cave where the underground city was located before, this cave was undoubtedly much smaller, but even if it couldn't be compared to that side, this cave was hundreds of meters in size and fifty or sixty meters high. Put it before the end of the day. It's also a magical natural landscape.

Not to mention, on the walls of the cave around this cave. There are also no less than thirty beads, and their light is even brighter than the night pearl, and I don't know what kind of magical gem it is.

At the same time, under this cave, there is a light curtain that flashes with infinite light, which reflects the beads above. It's good-looking.

Cheng Yang was in no mood to appreciate this magical beauty at the moment, because he found that the light curtain turned out to be a portal, the same as the portal to the other world outside Wucheng.

Cheng Yang's brows suddenly tightened, there was such a portal here, and things were a little tricky.

Obviously. This portal is supposed to lead to the orc world, but now there are no orcs coming out of it. As for whether he could teleport over from here, Cheng Yang hadn't tried it, and he couldn't get an answer.

But in any case, this portal is a hidden danger after all.

Cheng Yang circled around the portal, and even took out a giant axe and attacked the light curtain for a while, but it had no effect. If you want to destroy this portal, it is not something that Cheng Yang can do with his current ability.

Suddenly, Cheng Yang made a movement and directly reached out to support the light curtain.

A dark voice came into Cheng Yang's mind.

This is a one-way portal, and it can only be teleported from the opposite side, not from this side.

Cheng Yang was entangled in an instant, his feelings are still one-way, he can only fight the orcs himself, and he can't attack the orcs in the past, this is too much of a loss, right?

Cheng Yang waited here for a few minutes, and didn't see any orcs coming out of it, I don't know if it was because of the restrictions of the rules that couldn't send more orcs over for the time being, or because the orcs on the other side felt that the original orcs here were enough to wreak havoc on the human world and didn't need any more support.

No matter what the reason, it is impossible for Cheng Yang to continue to guard here now, not to mention that the situation outside is still unclear, even the big and small things in the territory do not allow him to wait here indefinitely.

Cheng Yang took one last look at this cave, if he could get a large amount of explosives to detonate here, he didn't know if he could destroy this portal.

"Hey!" Cheng Yang sighed, this is just his wishful thinking, since the end of the world, those thermal weapons of the human race are used a little less, and the biggest restriction is not others, it is explosives. Because the minerals used to make explosives disappeared when the end came.

Now Luofeng City has looted several provinces, and there are still several tons of explosives in stockpile. Although these tons of explosives are not very effective against demonic beasts or orcs, the effect is still very obvious in destroying buildings, which has been certified by Leshi and is absolutely reliable.

Even if this explosive could blow up this cave and prevent the orcs from coming out of here. But how many such portals are there in the world? Cheng Yang couldn't imagine it. Not to mention the others, in the country of Nir alone, there are three underground cities, and I am afraid there are three such portals.

How many can you blow up?

Next, Cheng Yang quickly exited the cave and returned to the surface without stopping.

For this underground world, Cheng Yang has nothing to look forward to. Originally, Cheng Yang thought that the underground city was a city that could be occupied, but now it seems that it is just a place to stay.

All that's left is to take care of the current location called Mahad, and also to prevent orcs from rushing out of the underworld.

Through this situation, it is certain that this magic tower must be preserved, and even the personnel inside cannot be replaced for the time being.

Although it is purely a waste to use the accelerated cultivation effect of the magic tower on the territory guards, but at this moment, the strongest combat power in Luofeng City, except for Cheng Yang, is the territory guards, in order to ensure the strong combat effectiveness of the magic tower, it is most appropriate to let the two magicians guard here.

Although Cheng Yang decided to develop the station in front of him, it was obviously not now, because at present, the Nier country still belongs to the orc country, and he can occupy Mahad Town, but he is only relying on his own strength.

If you only keep the magic tower here for the time being, you won't worry too much. The defense and durability of the magic tower are there, and even among the orcs, there are only a few who can have the durability of the magic tower to reduce its durability. If these people dare to rush over, the magic tower will definitely kill them one by one.

But if he wants to develop Mahad Town now and send a large number of people over, I am afraid that the orcs will immediately rush up and kill all directions, and there is no place for the evil fire in their hearts to vent.

The development of Mahad Town is inevitable, but it must be done after the orcs of the Neir Kingdom have been eliminated. (To be continued......)