In the past year, although the main task is to build a city, Roy still occasionally sends people to explore underground.

As everyone estimated, due to the presence of demonic worms, the underground world here has been dug up to the point of being riddled with holes, and countless cavern tunnels deep underground have crisscrossed to form a network of passages more complex than an ant's nest.

In Roy's words, it's a giant underground labyrinth.

Before, Roy used the demon eye he created to enter the underground to explore, but what he didn't expect was that even he was lost, and the dim underground world had no light at all.

A total of four waves of teams composed of lower demons have been sent one after another, but unfortunately, these lower demons have either been eaten by demon worms or other underground creatures, or they are completely lost in the labyrinth, unable to find their way back, and can only be re-summoned back by Roy, the entire exploration plan, the efficiency is amazingly low, so far, it has only been explored about a kilometer underground.

After successive setbacks in underground exploration, Roy could only put this matter on hold 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 is too barren, the extremely cold climate has caused no creatures to survive on the surface, and even some frost-based monsters can't be seen, and occasionally some ore veins have been discovered, but these ore veins are all poor ore without exception, and they can also see traces that have been excavated for a long time.

This also made Roy wonder if this fragmented world had other masters before......

If you want to dig these veins, you need to dig up a thick layer of ice, and it will not be long before these excavated ice layers will freeze again, which is very troublesome and very inefficient, and finally Roy simply gave up and turned his eyes all to the ground.

The good news is that Roy has the giant demon worm Da Hei in his hand, and although this mutated demon worm can't speak, it has a high intelligence, and some simple communication can communicate with it.

Bainia has been communicating with Daihei for a while, and has been training him to a certain extent, with the goal of at least being able to make Daikoku understand her requirements and be able to navigate her in the underworld, and now that Bainia has asked Juliel to inform herself, it means that progress has been made.

So Roy and Juliel left the Demon Hall and flew in the direction of the crater.

At the foot of the volcanic mountain, a huge cavern had been dug up, and at the edge of the cavern, Bainia had been waiting for her, and not far behind her, it was a lump of ...... A big black poop-like clump.

And the fat tiger, at this time, lies next to the big black, and from time to time it will straighten up and stretch out its paws to touch the big black, as if it wants the big black to play with it, but after being reprimanded twice by Bainia, he will lie down sullenly.

This picture made Roy a little unbearable to look at directly, he tried his best not to look at the aggrieved little eyes of the fat tiger after falling, and asked Bainia: "Is this going to go down in person?" ”

"Hmm!" Bainia floated with her wings raised, came over and hugged Roy's arm and said, "Now Dahei can basically understand my commands, so I think I can go down and have a look." ”

"Alright, let's go!" Roy nodded and said, "Juliel, you just stay on it, I leave the Demon Eye to you, I'll contact you if there's anything, you look at this guy Fat Tiger by the way." ”

Juliel nodded, "Okay." ”

Bainia put her right hand in her mouth and whistled at Dahei, and Dahei's huge body slowly bent down, Roy and Bainia jumped lightly and jumped to its head, and when they were seated, Bainia patted Dahei's hard skin, and Dahei went headlong into the huge cavern.

Roy only felt that the sight in front of him suddenly darkened, and he had already entered the underground with Da Hei, this cave was originally excavated by Da Hei, so it was very huge, even if he was sitting on Da Hei's head, there were still dozens of centimeters from the top of the cave, Da Hei carried Roy and Bainia, all the way down, at this time Roy's dark vision began to play a role, in the groundless underground, gradually became visible.

Along the way, Roy saw a large number of forks in the road, needless to say, those were all underground passages dug by the demon worms, and they didn't know where they went, and some of the passages also had magma flowing in them, it seemed that the demon worms had dug through the volcanic wall and caused the magma to flow out.

"This passage we are walking through should be one of the passages that Da Hei dug up before!" Bainia said to Roy next to her: "These demon worms have a keen sense of smell, and the passages they have dug by themselves will leave their own smell to help them identify their directions, I originally wanted the big black to take us to find the ore veins that make it mutate, but this expression is too complicated, the big black can't understand it, so I let it take us to the places it goes to the most!" ”

"Well, if Daikoku produced his mutation by devouring ore, then the location of the ore vein must be the place it frequents the most!" Roy nodded.

The speed of the big black is not too fast, Roy can feel it, it is not all the way down, but often bends around, it seems that the passages it dug before were basically dug at will, and now if it wants to go back, it can only follow these passages, otherwise, the passages dug by other demon worms are too small for it.

But even so, Roy they fell about two kilometers in a short period of time, and it is not clear how many Roy exactly, he only roughly estimated it by temperature changes.

Since there is a volcano, it means that the veins of the volcano are connected to the magma layer underground, generally speaking, the magma is generally formed in the depths of the earth's crust or the position of the upper mantle, this distance is about 30 to 50 kilometers from the surface, it is filled with a large amount of high-temperature liquid, that is, magma, if the magma of the magma layer is connected with the volcanic channel, then it will be transported to the upper part of the volcano little by little under the extrusion of the geological plate, if the extrusion pressure of the geological plate is too huge, Volcanic eruptions can occur, which is why volcanic activity is often accompanied by seismic activity.

Now Roy is going down, so instead of getting lower, the temperature they feel is getting hotter and hotter, and this heat comes from the heat emitted by the magma layer, which is extremely hot and stuffy in the tunnel that is not very ventilated at all.

As the big black continued to go deeper, the temperature in the air had risen to about 100 degrees, which exceeded the temperature of the abyss world, and even Bainia felt a little uncomfortable, so Roy applied a layer of ice armor to her to help her resist the heat.

"How far is this guy going?" Bainia was a little surprised, "The veins it feeds on can't be in the magma layer, right?" In that case, it would be difficult for us to mine even if there were mines! ”

Before Roy could talk, he suddenly saw a flashing object in a passage next to him, and he was startled, and hurriedly said, "Stop!" Stop it! Bainia, stop the big black! ”

Bainia didn't know what was going on, so she quickly kicked Da Hei a few times, and Da Hei, who got the signal, stopped running and slowly stopped in the tunnel.

Without waiting for it to stop, Roy spread her wings and flew back down the tunnel, Bainia following him, and then she saw Roy suddenly stop at a fork in the road, looking at the fork in the road with a look of surprise.

"What's wrong?" Bainia chased after him and asked Roy, who didn't answer, pointing to the fork in the road for her to see.

At this glance, Bainia was also very surprised, because she saw obvious traces of man-made objects in this fork in the road!

It was a shattered wall, or maybe it was part of a building, it was embedded in the rock wall of the tunnel, revealing a part of it, and if it weren't for Roy's sharp eyes just now, he probably missed it all at once.

Flying over, Roy pulled the thing out of the rock wall and examined the shard.

"It's a demonic creation!" Bainia said with certainty: "This style is very familiar, it should be ...... Some kind of part on the statue! ”

"So, there really were demons in this shard world before!" Roy said: "It should be some demon lord, but he is different from us, he has set up his lair underground!" ”

In fact, Roy had doubts from the beginning, this shard world is a very suitable environment for the frost demon to settle, it doesn't make sense that no other frost demon has found this shard world for so many years, it's just that Roy has been here for more than a year, and he has never seen a demon stand up and say that Roy has encroached on his territory.

Referring to the fact that the Demon Lord Anivia had said that someone was hunting the Frost Demon, Roy thought that even if this fragmented world had been occupied by other Frost Demon Lords before, it was estimated that he had been hunted and killed.

But when he saw this fragment of the demonic creation, Roy realized that he had guessed completely wrong, it was not the Frost Demon who had occupied this fragment world before, on the contrary, this former owner had placed his lair in a very hot underground world!

"Could it be the Demon Lord of some worm-type demon?" Bainia apparently thought of this as well, and guessed, "I don't think it's the only insect demon who likes to place their nests underground. ”

"Wouldn't you find out?" Roy raised the fragment of the statue in his hand and said, "However, even if it is really a worm-type demon lord, I think there is a chance that it is gone, this thing looks very ancient, I don't know how many years ago......"