Riding on an intercity train that resembles a subway, the Magic Expedition arrives in the Third Quarter, led by Baptiste.

Unlike the bustling First Quarter, it is noticeably more deserted, and there are not many long-term residents of the Erasmus Halfplane, partly because of its small size, and partly because of the slightly harsh living conditions.

Although there is a temperature adjustment circle to maintain the temperature and air of the underground city, and the dome above also projects a clear sky, this cannot change the oppressive feeling of human living in the underground world.

According to Baptiste, most of the residents of the Erasmus halfplane are researchers and their families who need to work in the rainforest environment, and some of the elderly who have come to recuperate because of the undeveloped environment here.

"There are two kinds of buildings in the Irasmus half-plane, one is an ordinary building built in an underground city, and the other is built on the ground like the immigration center you saw before, and the building on the ground needs to be built with a good foundation, and its own height is much higher, so only the rich can afford it, and there are more such houses in the fourth district."

Like a holiday home, Reiner guessed, as they stepped out of the station and onto an elevator.

The sign above the elevator suggests that this is the Erasmus Institute of Ecology, and it seems that this is where Baptiste conducts research.

Riding the elevator, after a period of darkness, a cacophony of sounds came from the outside world.

"Water?"

Jane stared curiously as a fat big-headed fish swam past the elevator, causing her eyes to widen.

As far as the eye can see, outside the elevator, there is a world under the water.

The roots of the stout trees are staggered, and in the cracks in the roots, schools of small fish are converging towards the lights in the elevator, and the low shrubs are now seaweeds at the bottom of the water, swaying slightly with ripples.

The water was very deep, and it was stormy outside, so it was dark underneath, and only the light of the elevator illuminated a small area.

"Is this the ground in the rainy season?"

One of Edgar's students, Robert, muttered to himself, he rarely spoke, making it impossible for Reiner to tell the three apart.

"At its highest, it can reach depths of more than 30 meters, making it a veritable lake."

Baptiste explained that the elevator moved up quickly, and the fish quickly lost track of the elevator and disappeared into the darkness.

Arimia looked up slightly, finally seeing a little light coming from above.

The next moment, the elevator rushed out of the water.

Beyond the glass, the storm was still raging, and the silver lightning was like a long snake, winding between the dark clouds, and the rolling thunder roared, making people palpitate.

As you can see, most of the seemingly "low" trees on the surface of the water actually have towering trunks under the water, and if the rain subsides, it will surely form a vast jungle.

The elevator arrives at the end, a building on the water, consisting of five small four-story buildings with grey facades washed by rain and looking crumbling.

"Welcome to the Erasmus Ecological Research Institute, this is a research institute directly under the Magic Association, and currently only one of my mid-level mages is on duty, and the others are all low-level mages."

Baptiste stepped out of the elevator and led the magical expedition to the lobby.

The windows here are beaten by the rain, and the continuous knocking sound makes the empty lobby seem not quiet.

"We live and study here, and you will live here during the next expeditions."

As soon as Baptiste finished speaking, he heard a commotion, and a group of figures rushed through the hallway, causing everyone to turn their heads.

"Uncle Baptiste!"

A group of children, about seven or eight years old, were trotting towards this direction.

"Yo, Brighton, why are you here?"

Baptiste smiled softly and touched the head of the little boy who was running at the front.

"When we heard that there were guests, we wanted to come and have a look."

The small boy was very cheerful, and he glanced at Reiner and them, and was not shy at all.

It was several children behind him, a little timid, who hid behind the boy and secretly aimed at this side.

"Wait, wait, don't run around......"

From the hallway came a mage in a white robe, her hair tied into a ball at the back of her head, and a pair of large, framed eyes, who looked to be in her early twenties, and a reckless appearance that matched Claire's.

"Ah, teacher."

The female mage saw Baptiste and hurriedly straightened her clothes and stood up straight.

"These are the guests?"

She glanced curiously at the people of the magical expedition, her gaze lingering on Reiner's face for a moment.

"That's right."

Baptiste nodded, then introduced to the group.

"This is my student, Windsor, and as for these children, I'll explain it to you later."

He seemed to have something to do, and then looked at his student Windsor.

"Windsor, you can take the children back first, and by the way, inform the other students that we are going to entertain guests tonight."

Windsor nodded hurriedly, urging the children to go back from the hallway again.

Seeing the children walking away, Baptiste sighed slightly.

"These children are all sick with Auburns' allalla."

"Aubanscara disease?"

What kind of disease is this? Reiner was confused, he didn't study much about medicine, and at this time, an inexplicable illness suddenly appeared to him, which made him puzzled.

"This is a disease that has gradually increased with the development of cities, most of them are affected by excessive magic in infancy, the body organs have failed, they are extremely sensitive to the surrounding environment, and most of the patients do not live to be over fifteen years old, it is an extremely malignant disease."

Arymia said that she had studied necromancy before, and knew a lot about these special diseases that were born out of magic.

"Oh, I didn't expect you to know about this disease at such a young age."

Baptiste was a little surprised, and then added.

"The discoverer of Obens Scala was none other than Aubans. Carla, a necromancer, said that this disease is quite rare and usually, due to the surrounding environment, most children die within one to three years of birth, so cases are rare. ”

"And these kids over here?"

Jane looked in the direction where the children had left, she didn't expect that these seemingly innocent and lively children had already borne such a tragic fate since they were born.

"In fact, in addition to studying the evolution of species, another of my studies is the treatment of Aubanscara disease."

Baptiste said, the expression on his face was extremely solemn.