In the past year, although the main task was to build the city, Roy still occasionally sent people to explore underground.

As everyone estimated, due to the existence of demonic worms, the underground world here has been dug so that it can be described as riddled with holes. There are countless caves and tunnels in the depths of the ground interlaced, forming a bigger than an ant nest. A complex traffic network is also required.

In Roy's words, this is a huge underground labyrinth.

In the past, Roy used the demon eye he made to go underground to explore, but unexpectedly, even he himself lost his way. The dark underground world has no light at all. Explore a few more places , Roy himself lost his sense of direction and didn't know where he was. As a last resort, he could only send people to explore.

A total of four waves of low-level demons were sent out one after another, but unfortunately, these low-level demons were either eaten by demon worms or other underground creatures, or they were completely lost in the maze and could not be found. The way back was over, and he could only be summoned back by Roy in the end. The efficiency of the entire exploration plan was astonishingly low. So far, it has only explored about one kilometer underground.

After successive setbacks in underground exploration, Roy could only shelve this matter for the time being, but after the completion of Frostfire City some time ago, this matter was put on the agenda again.

No way, after a year of exploration, Roy found that the surface of this fragmented world was too barren. The extremely cold climate caused no living things to survive on the surface, and even some frost-type monsters could not be seen. Some veins, but these veins are all lean ore without exception, and you can still see traces of being excavated for a long time.

This also made Roy wonder whether this fragmented world had other owners before...

If you want to excavate these veins, you need to dig through a thick layer of ice, and these dug out ice layers will freeze again soon, which is extremely troublesome, and the efficiency of collecting is very low. In the end, Roy simply He gave up and turned all his eyes to the ground.

The good news is that Roy has the giant demon worm Dahei in his hand. Although this mutated demon worm cannot speak, it has higher intelligence, and it is possible to communicate with it through simple communication.

Bainiya has been communicating with Dahei during this period of time, and has conducted certain training for it. The goal is to at least make Dahei understand her request and be able to navigate the underground world for her. Now that Baini Ya asked Julie to inform herself, which means that progress has been made.

So Roy and Julie left the Devil's Palace and flew towards the crater.

On the ground at the foot of the volcano, an extra huge cave was dug out. By the edge of the cave, Bainiya had already been waiting here. Not far behind her, there was a pile... a pile of **** Big black.

And Fat Tiger, this idiot, is lying next to Dahei at this time. From time to time, it will straighten up and stretch out its paws to touch Dahei, as if asking Dahei to play with it, but it was caught by Bainiya After two reprimands, he fell down sullenly.

Roy couldn't bear to look at this scene. After he fell down, he tried his best not to look at Fat Tiger's aggrieved eyes, and asked Bainia, "Is this going to go down in person?"

"Yeah!" Bainiya raised her wings and floated, came to hug Roy's arm and said, "Now Dahei can basically understand my instructions, so I think I can go down and have a look."

"Okay, let's go there!" Roy nodded and said, "Juliel, you stay on it, I leave the devil's eyes to you, I will contact you if there is anything, you look fat by the way Tiger guy."

Julie nodded and said, "Okay."

Bynia put her right hand in her mouth and whistled towards Dahei, and the huge body of Dahei slowly bent down. Roy and Bynia jumped onto its head with a slight jump, and waited until After sitting down, Bainiya patted Dahei's hard skin, and Dahei went headlong into the huge cave.

Roy felt that the sight in front of him suddenly went dark, and he followed Dahei into the ground. This cave was excavated by Dahei, so it looked very huge, even if he was sitting on Dahei's head, far away from the cave There are still tens of centimeters on the top, and the **** is carrying Roy and Bainiya, tilting all the way down. At this time, Roy's dark vision starts to play a role, and gradually becomes possible in the dark underground. It's visual.

Along the way, Roy saw a large number of forks passing by in a flash. Needless to say, those were all underground passages dug out by demonic worms. He didn't know where they were leading to, and some passages were still flowing with magma. It was the devil worms who dug through the volcano wall and caused the lava to flow out.

"The passage we walked should be one of the passages dug by Dahei before!" Bainiya said to Roy from the side: "These devil worms have a keen sense of smell, and the passages they have dug themselves will leave their own Smell, to help them identify the direction, I originally wanted Dahei to take us to find the ore vein that caused the mutation, but this expression is too complicated, Dahei can't understand, so I let it take us there Where it goes most often!"

"Well, if Dahei mutated by devouring ore, then the location of the ore vein must be the place where it goes most often!" Roy nodded.

The speed of Dahei is not too fast. Roy can feel that it is not going all the way down, but bends around from time to time. It seems that the passages it dug before are basically dug at will. Now To go back, he had to follow these passages, otherwise, the passages dug by other devil worms would be too small for it.

But even so, Roy and the others fell about two kilometers in a short period of time. Roy didn't know exactly how much. He only roughly estimated it based on temperature changes.

Since there are volcanoes, it means that the veins of volcanoes are connected to the magma layer in the ground. Generally speaking, magma is usually formed deep in the crust or in the upper mantle. This distance is about 30 to 50 kilometers from the surface. There is a large amount of high-temperature liquid here, that is, magma. If the magma in the magma layer is connected to the volcanic channel, it will be transported to the upper part of the volcano bit by bit under the extrusion of the geological plate. If the extrusion of the geological plate When the pressure is too great, volcanic eruptions will form, which is why volcanic activity is often accompanied by seismic activity.

Now Roy and the others are walking down, so instead of getting lower, the temperature they feel is getting hotter and hotter. This heat comes from the heat emitted by the magma layer. In the tunnel that is not very ventilated, It was extremely stuffy.

As Dahei continued to go down, the temperature in the air had risen to about 100 degrees at this time, which had exceeded the temperature of the abyss world, and even Bainiya felt a little uncomfortable, so Roy imposed on her She wears a layer of ice armor to help her resist the heat.

"How far is this guy going to go down?" Bainiya was a little surprised: "The veins it feeds on, wouldn't it be in the magma layer? In that case, even if there are mines, it will be difficult for us to mine!"

Before Roy had time to speak, he suddenly saw a passing object in a passage next to him. He was startled, and hurriedly said: "Stop! Stop! Bainiya, let Dahei stop!"

Bainiya didn't know what happened, so she quickly kicked Dahei a few times, and Dahei stopped running after receiving the signal, and slowly stopped in the tunnel.

Roy didn't wait for it to stop, so he spread his wings and flew back along the tunnel, and Bainiya followed behind him, and then she saw Roy suddenly stop at a fork, with a surprised expression on his face. Looking into the fork in the road.

"What's wrong?" Bainiya chased after her and asked Roy, but Roy didn't answer, and pointed to the sidewalk for her to see.

Looking at it, Bainiya was also very surprised, because she saw obvious traces of man-made objects in this fork!

It was a broken wall, or it should be a part of a certain building. This thing was embedded in the rock wall of the tunnel, and part of it was exposed. If it weren't for Roy's sharp eyes just now, it would probably be a part of it all at once. Just missed it.

Flying over, Roy pulled the thing out of the rock wall and looked at the fragment carefully.

"It's a devil's creation!" Bainiya said with certainty: "This style is very familiar, it should be... a part of some kind of statue!"

"So, there really were demons in this fragmented world before!" Roy said, "It should be some demon lord, but he is different from us, he put his lair underground!"

In fact, Roy was skeptical from the very beginning. This fragmented world is a very suitable environment for the Frost Demon to settle. It makes no sense. Over the years, no other Frost Demon has found this Fragmented World, but Roy came here. It has been here for more than a year, and I have never seen a demon stand up and say that Roy has invaded his territory.

In connection with what the demon lord Anivia had said before, that someone was hunting the frost demon, Roy thought that even if this fragmented world had been occupied by other frost demon lords before, they would probably have been hunted to death.

But when he saw the fragments of the devil's creation, Roy realized that he had guessed completely wrong. It was not the frost demon who had occupied this fragmented world before. On the contrary, the former owner had placed his lair in a very The hot underground world is here!

"Could it be the demon lord of a worm-type demon?" Bainiya obviously thought of this, and guessed: "In my impression, only worm-type demons seem to like to place their lairs underground."

"Can't you find out if you look for it?" Roy raised the statue fragment in his hand and said, "However, even if it is really a worm-shaped demon lord, I think it is probably not there anymore , This thing looks very old, I don't know how many years ago it was..."