Compared to the surface, the undercity was a dangerous place.

Not only were there many underground residents hiding in the shadows but there were also dark creatures from the Shadow Plane or the Evil Spirit Plane.

In the Hundred Cities Division Plan.

The Seven Saint Alliance had once warned the mages of the various city-states that if they wanted to develop the underground space of their city, they must strictly abide by the 300-meter rule.

In other words, the depth of the tunnel could not exceed 300 meters.

In actual practice, it was the safest to operate within 180 meters.

In the history of Aindor, it wasn’t rare for a city to be destroyed because the people dug too deep.

The undercity had another set of survival logic.

This was also related to the fact that the Calamity Mage did not touch the dark gods hidden underground when they were exiled to the Heavenly Palace.

Therefore, when Matthew planned his underground space, he strictly followed the 300-meter rule.

In fact.

His cemetery was only seven to nine meters below the ground, and the security measures were definitely fully implemented.

After listening to Ghost Ali’s description.

Matthew’s first reaction was,” Could there be a trap?

He did not suspect Ali of setting him up, but it was rare for an open-air sulfur mine to appear underground.

Because dark creatures needed sulfur, it was considered a hard currency for the creatures of the undercity.

Once a sulfur mine was discovered…

It would definitely be mined clean at the first moment.

Considering that the underground space in the Gold Digger Basin had been repeatedly ploughed by human miners, adventurers, kobolds, gnolls, and other underground creatures many times in the past, Matthew felt that the probability of a fish slipping through the net was low.

“However, if the sulfur mine is close to the surface and the location is tricky, it is indeed possible that no one will know about it.”

He asked about the location of the sulfur mine in detail.

After confirming that it was within 300 meters of him.

Matthew decided to lead a team to investigate.

He asked Ali to lead the way and called a team of skeleton soldiers, a team of Silvermoon Zombies, and six spirit wolves.

They walked majestically into a small tunnel.

Along the way, Matthew had a sudden idea and used the ” Undead

Transformation Spell.”

He had become a skeleton dwarf who had been a musketeer when he was alive, mingling among the skeleton soldiers.

In front of him was Renesme, behind him was Soldier, and on both sides were the other undead.

Dwarves were too short.

Matthew was sure that the enemy would not be able to find him if he hid among the soldiers.

But correspondingly.

He didn’t seem to be able to see what was around him.

Along the way.

He was only looking at Renesmee’s ass…

This underground march took about two hours.

Ali led them to a turbulent underground river. Matthew could tell from his sense of direction that this river was most likely a branch of the Old Woman River on the surface.

They walked along the underground river for another twenty minutes.

There was no road ahead.

Ali pointed at the dark stone wall and said,

” This wall only looks thin. After about five meters, there will be a hollow underground basin.

“If you’re a creature with a corporeal body, you can swim through the underground river. I remember there’s an entrance there.” Matthew asked Renesme to go into the river to give it a try.

Not long after.

He sensed all the safety signals from the contract.

He could feel that Renesme was not far from him, only about ten meters away.

This meant that Ali wasn’t lying.

So he led the team down the river and swam for a short distance. Sure enough, they easily found the underground basin that Ali had mentioned.

The moment he came out of the water.

Matthew smelled a strong, stimulating, and choking smell.

The air in the underground basin was hot and humid.

Matthew made a preliminary estimate and found that the depth was about 800 meters, and the horizontal space was 60 meters. The height above the head was relatively low, only 3 to 4 meters.

There was indeed a sulfur mine near the surface.

Matthew was not a mineral scientist, but his basic knowledge as a mage was enough for him to make a judgment.

This sulfur mine was easy to mine, and its purity was not low.

If he developed it properly, he could earn a lot of money!

This discovery made Matthew both happy and worried.

Naturally, he was happy about the windfall.

The worrying thing was that there was only one possibility for such a high-purity sulfur ore to appear here, excluding the possibility of an underground volcano.

There were cracks from the abyss in the underground basin.

The sulfur was leaking out from inside.

It was well known that demons viewed sulfur as a tonic, and their noses naturally could search for sulfur mines.

Who knows, a few demons might come over soon.

“I can do a node survey in advance and then plug the crack.

” The Evil Demons might not be able to find us in time. Even if they do, they’ll probably be small fries. It’s not to the extent that we can’t deal with them.”

Matthew composed himself.

He asked Ali,

“Have you seen any demonic creatures nearby?”

Ali shook his head.

“No, I haven’t.

” There’s a nest of cave dwellers downstream of the underground river. They rarely come here.

” There’s a Hook Horror tribe in the lower space about five miles away from here. Their numbers are relatively large, but it’s too humid here. They won’t come here.”

Matthew looked at Ali with interest.

“Do you know much about the Hook Horrors?”

Hook Horrors were common underground creatures.

They had the head of a vulture and the body of a giant beetle, as well as an exoskeleton decorated with spikes and bony spikes.

The claws at the ends of their limbs were extremely terrifying..

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