The fourth day of the trip.

After a huge fork in the road, the road became more and more difficult, and the speed of the whole army was noticeably slower, and even stopped many times.

In addition, Li Xuan felt that the light in this area was obviously not as bright as in the previous places, and the underground woods were also thinning, many trees only had bare trunks, and the air was filled with a faint smell of sulfur.

That smell of sulfur made Li Xuan feel a little familiar, in his memory, when he was a child, in his hometown, during the Chinese New Year, because of the fireworks and firecrackers that filled the whole town, it was this faint smell of sulfur.

"Your Excellency Li Xuan. Sosa rode from behind on a handsome white horse, parallel to Li Xuan.

Li Xuan glanced back at her and nodded at her, in the past few days, he has not taken a carriage again, he is riding a dark war horse, advancing with the entire army at a uniform speed.

The scenery of the underground world is very distinctive, and all kinds of complex environments are quite interesting, these days, Li Xuan has wanted to try to fly into the air of the underground world many times to see how high this underground space is.

Li Xuan asked Sosa some scholars who followed him, but he didn't get a precise standard, but he learned some "advanced knowledge" in this world, such as length units, there are many kinds of length units in this world, but there is some consensus between each academy and scholars, a strange measurement standard: "Loka".

According to the conversion, the length of a loka is about 2 meters long.

Scholars have told Li Xuan that the height of the underground world is about 2,000 lokas to 10,000 lokka, and the height of the underground world in different regions is completely different. In the area where they are currently located, the height of the underground world can only be regarded as a medium height, which once again makes Li Xuan feel that this world is very wonderful.

"I heard you have a manor in Carostone?" Sosa began to ask about more personal topics after he and Li Xuan went along.

Li Xuan nodded at her and replied, "Lord Orin Stanlini recommended me a nice manor, although it is not very big, but I do like that small manor, because there are several rows of maple trees in the manor that grow very well, so this manor was renamed Maple Leaf Manor by me." ”

"I love maple leaves, and every year after autumn and winter, when these leaves turn red, the whole world becomes richer. Sosa said to Li Xuan with a smile.

Li Xuan nodded and smiled at her.

Sosa is a very good-looking female swordsman, although Li Xuan has not fought against her, but it is rumored that if it is true, Sosa's strength must be very strong.

From the first time we met, until now, Sosa has given him a very good feeling, knows how to figure out people's hearts, and does what they need, and the style of doing things is also very direct and decisive.

After a few days of communication, Li Xuan has some basic understanding of Sosa, but has not had more in-depth exchanges on some more personal issues. For example, until now, Li Xuan doesn't know Sosa's age.

"If I have the chance, I'd like to visit your estate. Sosa said to Li Xuan with a smile.

"Of course, no problem, before leaving, I bought some land on the left and right sides of the manor to expand the area of the manor, to make a hospital and school. Li Xuan said slowly.

"Hospitals, schools, and schools are used to treat diseases and spread civilization?" Sosa asked, frowning.

Li Xuan nodded.

"Why would you want to do this?" asked Sosa, confused.

Li Xuan glanced at her lightly and replied: "The medical treatment in Carouston is too rough, and the civilization is not very systematic and orderly, since I have come there, I hope to leave something behind." ”

Although Sosa still didn't understand why Li Xuan did this, she still nodded respectfully to Li Xuan. After all, whether it is to cure diseases or spread civilization, they are two very great and meaningful things.

The exchange between the two men ended with the halt of the army, and they reached the outskirts of the Brimstone Cavern, where they were about to settle down and begin to lay out their fortifications in large numbers.

At this time, a scout whom Li Xuan had never seen before rode up to him and Sosa on a fast horse.

The scout saluted Sosa and said, "Lord Sosa, we have arrived at our destination, and now the army is beginning to disperse, please give instructions on the next step." ”

Sosa's eyebrows were raised, his expression was solemn, and he commanded solemnly: "Everyone choose a more suitable place and start laying out the fortifications!

The waiter nodded quickly, kicked the horse's belly, and quickly returned.

"Ahead is the Sulphur Cave?" Li Xuan asked, looking at Sosa.

Sosa nodded and said to Li Xuan, "You have already entered the border, and if you move forward, you can see the sulfur cave of the poisonous dragon." ”

"Can you see it here?" asked Li Xuan.

"It can't be here, unless it rises into the air, if it's high in the air, you may be able to see it, but ......" Sosa's words were not finished, and he watched speechlessly as Li Xuan released the reins, and the whole person flew into the air, quite fast.

"Flying thaumaturgy!" "High-level fifth-level qi flying magic.

After Li Xuan cast the "flying thaumaturgy", the whole person flew up quickly, and the speed continued to increase, and countless qi magic elements held him up, following his mind and flying freely in the air.

Soon, the army quickly turned into small black dots, and the phalanx that had not yet begun to be stationed also became small squares, and the air in the underground world was completely different from the ground world, there was no strong air current, only some warm currents gently, and the amplitude was very small.

Li Xuan soon lost sight of the army on the ground, and the whole person flew thousands of meters into the air, but when he looked up, he still felt that he was still only in the bottom space of the underground world.

It flew in the direction of the top of the ground again, and after flying for a long time, Li Xuan saw some color changes, some dark green and brown, which seemed to be some vegetation.

Taller and higher, taller and taller.

Finally, Li Xuan clearly saw countless thick vines and tree roots, most of these vines were covered with faint Dolan, and the top of the entire underground world was full of dense shimmers, soft, but not dazzling.

Floating quietly dozens of meters away from the area at the top of the underground, Li Xuan clearly saw the appearance of the entire underground world, which was a little different from what he had imagined before.

The outline of this underground world is like a huge oval-shaped pipe, and he and the rest of the human beings are like a little bit of bacteria in this pipe.

Li Xuan not only sighed at the wonder of this world, after he stayed in the area near the top for a long time, he began to descend slowly, and after descending for a long time, his gaze looked ahead, and in the direction of the army, he saw what he wanted to see.

Brimstone Caves!