The Subterranean World of the Otherworld Continent!

Looking at Tyrell and Barr who flew out of the castle, Mike relaxed.

He yawned again, feeling sleepy.

After all, he stayed up late last night and soon faced a battle.

He still needed some sleep.

At this moment, he suddenly felt something.

He opened his [friend message].

It was a reply from Lin Yaoyao, [Big Mike, is it really you? Yaoyao is so happy. I didn't expect to be able to add Big Mike as a friend. Hehe!]

The next moment, another message came.

[Big Mike, Yaoyao's army is the gray dwarves. They specialize in mining, refining, and forging equipment.]

[The location of the castle is in the underground world.]

[There are stone mines and iron mines around here.]

[I've already sold all the stones that I've collected from the stone mines, but I've stored a large amount of iron ore. I'm smelting refined iron.]

[I estimate that there will be more than 400 units!]

[Does Big Mike need them?]

Mike replied, [I want them all. What's the price?]

Lin Yaoyao said, [One unit of food for four units of refined iron. Big Mike, can you take a look?]

Mike was stunned. He thought he was going to bleed.

After all, refined iron was more precious.

However, he did not expect the exchange price to be lower than the price he set in the space exchange yesterday.

Yesterday, he set a price for one unit of food for three units of refined iron, but he got nothing.

Now, Lin Yaoyao was willing to exchange four units of refined iron for one unit of his food.

What was she doing? Mike was a little curious.

[Didn't you see my exchange price in the space exchange?]

Lin Yaoyao said, [I saw it! But Yaoyao wants to work with Big Mike for a long time. If It's a fair trade, Big Mike might not work with Yaoyao in the future!]

[Big Mike is so powerful!]

[Yaoyao wants to work with Big Mike all the time.]

When Big Mike saw this, he could not help but label Lin Yaoyao as a shrewd businessman!

It might seem that Lin Yaoyao was at a disadvantage.

But if they worked together for a long time, she still made a profit.

After all, Big Mike was publicly recognized as the strongest Castle Lord. In the early stages, he used the difference of one unit of refined iron to exchange for long-term cooperation with Big Mike. This was a very meaningful investment.

In the middle and later stages.

Not to mention the difference of one unit of fine iron.

Even if he put a box of strange crystals in front of Mike, he would not be tempted.

Mike replied, [we can work together! When I gather food, I will come and look for you.]

Lin Yaoyao replied, [that's great!]

Mike was actually very curious about how Lin Yaoyao smelted refined iron.

After all, refined iron was one of the materials needed to upgrade a town.

But he had never heard of any castle lord who could refine iron ore into refined iron.

Mike asked curiously, [how did you refine iron ore into fine iron?]

Lin Yaoyao replied, [Haha, that's nothing! It's just that when my gray dwarfs were digging iron ore, they accidentally dug a rat to death. I didn't expect that they would drop a blueprint for a smelting furnace. I've already built a smelting furnace. As long as I throw the iron ore in, I can refine fine iron!]

Just by killing a rat, they dropped a blueprint.

The corners of Mike's mouth twitched. She was too lucky.

Thinking of the past few days, Tyrell and Barr had been fighting with their lives on the line.

They had killed quite a number of monsters. There were at least 300 of them, if not 500.

He did not see a single trace of a blueprint.

There was no comparison.

However, he looked outside the castle and fantasized about stepping on a few rats to see if he could drop a few blueprints.

...

At this time in the Otherworld Continent.

In an underground world.

There was an intermediate castle.

In the mining area outside the castle, more than ten gray dwarves were working hard to collect iron ores.

Above the castle's courtyard, there was black smoke billowing out of a 30-meter-tall smelting furnace.

Beside the smelting furnace, there were a few gray dwarves who were constantly throwing iron ores into the furnace.

Beside them stood a gray loli in a pleated dress who was giving instructions.

"Everyone, do your best!"

"I've found a big client for everyone!"

"It's the most powerful Castle Lord in the Otherworld Continent!"

"I believe that it won't be long before everyone can live a good life!"

The little loli said happily.

"Yes, Your Highness Yaoyao!"

All of a sudden, all the gray dwarves started working even harder.

Mining, mining, smelting...

The sounds of 'hey hey' could be heard endlessly!

...

In the Dragon King Castle, Mike also obtained some information from his conversation with Lin Yaoyao.

As long as he had the blueprints, he could build some special buildings.

However, the blueprints were not so easy to obtain.

It was not difficult to see from the hunting of monsters in the wild these few days.

The blueprints were also considered as special resources.

Killing a tier 4 elite-level miniboss did not drop any blueprints.

From this, it could be seen that one would need to kill a tier 4 or above monster in the wild to have a chance of dropping them.

A tier 4 wild monster was already considered an elite tier mini-boss.

A tier 5 wild monster was an elite tier boss.

As for tier 6 and tier 7, they were already commander-level monsters.

These commander-level wild monsters were also very powerful. Compared to an elite tier monster, they were much stronger.

They would also command many powerful monsters in the wild.

The higher tier 8 and tier 9 monsters in the wild had the strength of a lord.

When they reached their limits, they could become demigods. They were also the top creatures in the Otherworld Continent.

To the current Castle Lords, they were undoubtedly an invincible existence.

Mike was still rather envious of Lin Yaoyao. After all, with a smelting furnace, they could have an inexhaustible supply of refined iron.

Luck was something that could not be touched or seen.

It was better to take one step at a time.

Mike did not think too much about it.

One had to know that he was already lucky enough. Compared to the other Castle Lords, he had a super top-grade military branch.

And it was also a unique military branch.

The other Castle Lords did not have the luck of having a unique military branch.

After chatting with Lin Yaoyao for a while, they also solved the problem of the refined iron needed to upgrade the castle to a town.

At this point, as long as they had food, they could always exchange for refined iron.

The problem that troubled him was also solved.

Mike could not help but feel more and more sleepy, yawning a few times.

Before going to bed.

Mike also packed up the weapons and defensive equipment that he had obtained into three pieces and put them on the [space exchange].

These pieces of equipment from the goblins were naturally very low-grade.

To him, it was not necessary.

His army species was a giant dragon, and the scales on his body were tough defensive equipment. His sharp claws were also weapons, and he could even breathe fire.

Moreover, had he ever seen a giant dragon that used weapons?