The latest website: Not far from the entrance of the hole, half a shallow shoe print stayed there alone.

This shoe print still has the heel part, and the front half was erased by the traces of the mud monster walking on the ground.

From the direction, someone walked here some time from the direction of the nearby river, leaving it on the way to the mouth of the cave.

Judging from the size of the shoe print, the other party is likely to be a male. But there is no way to judge the weight, because the moisture content of the soil at that time is unknown.

The traces left by the slime monsters on the ground are also quite suspicious. These slime monsters swarmed out of the hole, and almost always walked in a straight line after leaving the hole. There were no traces of them staying around, as if there was something terrifying inside the hole.

This discovery made the two of them instantly raise their hearts, and it seems that this matter is indeed not simple.

There was a slight wind blowing from the entrance of the cave, they prepared the lamps, and then walked slowly into the cave.

It's just that all the clues on the ground and around were erased when the slime monster came out, especially the king of the slime monster, it can be seen that it was squeezed out of this narrow passage.

The dirt on the wall was still damp, and Charles took some samples back in a small glass bottle.

The collapsed passage was more than 20 meters long, and the two quickly came to the complete passage.

This main road can accommodate two carriages running side by side, and the height is quite impressive.

They found the lamp bowl on the wall. The stone bowl was full of dirt. Through spiritual exploration, there were many carbon marks left by oil lamps on the top of the passage above.

"It's actually an oil lamp?!" Charles was surprised.

Because the lighting magic circle has a very long history, most of the artificially built dungeons are illuminated with magic lights, unless the local magic power is thin or the party who built the dungeon is too poor.

In addition, there are two other possibilities, one is that the dungeon was built before the invention of magic lamps, and the other is that these oil lamps have some special function or religious purpose.

The two studied for a while and had no clue, and then moved towards the depths.

Not long after, two symmetrical doorways appeared on both sides of the passage. After some exploration, they were all rooms of about ten square meters in size. There was nothing inside except the traces of the mud monster's life.

The next discovery made Charles feel that the party A in this dungeon had obsessive-compulsive disorder, because several rooms that appeared on both sides of the passage were symmetrical, not only the same size, but also the positions of some stones that were suspected to be stone tables and chairs. The same is true.

It's a pity that the environment here is quite humid, and there were mud monsters who lived there. Nothing of value was preserved along the way, only some rough utensil fragments such as pottery bowls and pots were found, and there were occasional pieces from the outside. The bones of the animals that came in.

"It's so strange," Artoria said, "there are too few magical elements here."

Charles nodded. The deeper he went, the less magic elements around him. He said, "Indeed, this is very abnormal. There may be something that is absorbing the surrounding magic elements."

"What do you think this place is used for?"

Arturia thought for a moment and said, "This main road goes straight to the ground without turning and cannot be fortified. It should not be a military building."

"The rooms on both sides are like warehouses, and there is no such place as a kitchen for living."

The two continued to walk in. After walking for a while, the rooms on both sides changed, and suites that looked very similar to the two-bedroom, one-living and three-bedroom, one-living layouts began to appear.

At this point, there are fewer and fewer magic elements around, and ordinary magicians can no longer cast magic.

Charles said: "Is there a realm of forbidden magic?"

Artoria shook her head, she didn't know everything, and the main body did not sound the alarm.

They walked slowly for nearly an hour, and a stone door on the right half collapsed appeared in front of them.

"Hi..." Charles sucked in a breath, "The magic element behind the door is too strong, it seems that the surrounding elements are gathered here."

Arturia frowned and said, "Get ready to go in."

Charles nodded, he felt a slight wind blowing out, but he was wearing a gas mask and didn't know what the wind was about.

Artoria walked ahead with the Ex curry stick and entered the stone gate first. Charles was holding a black chicken leg stick, and various magic shields were brushed layer after layer.

Inside is a huge cavity, thirty to fifty meters in diameter, and there are several huge holes in the ceiling ten meters high, and it seems that fresh air is flowing in from there. In the middle lies an altar-like high platform, with the strongest magic elements on it. The ground was muddy and full of traces of the activity of the slime monster.

They quickly walked away to find that there was a pile of ashes deep in the void, which looked new.

Arturia flicked her sword a few times, and found a little unburned plant at the bottom.

Charles identified it carefully, and said coldly, "I know a herbal formula, which emits an unbearable stench when burned, and the effect is the same as the 'Stinky Beast' potion. These herbs are part of the formula. one."

Arturia said: "You mean that someone drove the slime monsters out here by burning these herbs?"

Charles nodded and said, "I speculate that this is the base camp of the Sludge Monster. A Sludge Monster living here evolved into the King of Sludge Monsters because of its strong magical elements."

"Someone came here not long ago, and for some reason, they drove out the slime monsters."

Artoria was noncommittal, holding the searchlight carefully to check whether there were any useful clues left on the surrounding walls.

Charles used his mental power to probe the ground, collecting some soil samples from time to time for analysis after returning.

But there was no clue of any usefulness, as if the pile of ashes had just popped out of nowhere.

However, if the person entering is flying, this is normal.

Finally, the two came to the stone platform, which was the most special place in this underground city.

Arturia's body suddenly moved, "There is a very strong energy underneath."

Charles used his mental power to study the stone platform with a diameter of less than ten meters and a height of more than one meter, and said: "It is divided into three layers, the middle layer is a huge but ancient magic gathering array, and the gathered magic power is transmitted to the ground. , the top layer should be the protective layer."

"The most important thing is that there is a passage leading to the underground in its center, which can be seen by opening the slate."

Arturia looked at him, but said, "Do you want to go down?"

Charles nodded~lightnovelpub.net~ He jumped onto the stone platform, removed the floating soil above, and pryed open the circular stone slab in the middle, and a hole with a diameter of more than one meter appeared in front of them.

Then he squatted beside the hole, took out a spherical magic lamp, lit it up, and threw it in.

There should be a **** inside the hole. After the magic lamp fell vertically for a few meters, it rolled down. There was no sound of falling step by step on the stairs.

Then put down a "terrifying spider" with a diameter of half a meter. The footsteps of "Tattoo" changed from loud to quiet, and there was no sound of fighting.

"It looks like it's safe down there." Charles breathed a sigh of relief, "What do you think it would be down there?"

Duo Mao swayed at a faster speed at this time, and the carrier said: "There may be terrible existences in it, so we must eliminate them, otherwise the damage will be more serious than the plague."

Charles stood up, swapped his gas mask for an oxygen tank and face shield, and jumped off.