When the old man came up, he didn't explain the situation of looking for them.

Instead, he asked rather kindly:

"How's the production of [Tesla grenades]? Do you want the old man to give you some more advanced engineering knowledge for free? ”

As soon as Helo heard it, he knew that it was definitely not a good thing to look for them.

There is no pie in the sky.

His friendship with the old man is definitely not so high, and even Guzman, the system mentor, will not be so good to him.

Even if he triggered the fusion of the soul circuit in the process of transforming his eyes, in the eyes of the mentor, before the official experiment yielded results, the reward was 580 soul coins without tuition.

"I just brought it to you, while I was still free during this time, I made a total of 35 pieces, give me money."

Helo walked into the room and took out 35 grenades directly from the [Flea Skin Bag] and brought them to the old man, waiting for his identification.

"Don't worry, I'll have to take a look first."

Fortunately, the old man had disassembled the grenade made by Helo before.

I still know a lot about some of the characteristics, and after a while, all the checks were completed.

"There's no problem with the goods, but what does the inscription on it mean?"

The old man frowned, pointed to a row of words on the arc-shaped shell of the grenade, and asked puzzledly.

He had been rummaging through it in his mind for a long time, and he couldn't remember what era it was, let alone recognize it.

Helo, who was originally expressionless, couldn't help but smile at the corner of his mouth when he heard the old man's doubts:

"The text of my hometown, 'Lockheed' is just a certification made by me."

Herlo's explanation made the old man nod in approval.

This is very common, but mostly in the case of engineering masters, soul machine masters.

After all, this kind of certification is a kind of quality assurance.

But Helo... In the short term, there is no name, and perhaps those potential customers will become loyal customers after they taste the sweetness of 'Lockheed' products.

The old man beckoned to 'Lilith' to fetch a money box.

Open the money box, and inside it are stacked soul coin money bags.

100 Soul Coins per bag.

The old man counted 17 money bags, took out a commonly used money bag from his pocket, and poured out 50 soul coins.

"You count the 1,750 soul coins, and after you leave this room, you won't be responsible for the money and goods."

The old man shoved all the money in front of Helo.

Helo also didn't expect that the wealth brought by 35 grenades would be so shocking.

It's the equivalent of two sacks of coins.

Even Byrne, who accompanied the inventory, was a little shocked.

"It's so profitable! You can earn 1,750 Soul Coins in just one week! ”

Heloh saw that Byrne's eyes were reddening.

The kid had been stimulated by him from the last time he was in the burrow.

Since then, it's easy to get excited when it comes to Champyerne.

I don't know if it's a good thing or a bad thing...

"You want to study [engineering] too?"

Byrne nodded frantically like a woodpecker.

"Is your soul circuit helpful in this regard? Or are you confident that you can keep the cost down?

With these 35 grenades alone, I consumed 100 raw materials, which means that I wasted more than 200 soul coins. This was only done with the help of my soul circuit.

Just the time taken up by the soul magic formula that carved the inside, I didn't have a good rest in the past few days. ”

Helo indifferently recounted the difficulty of this choice.

Of course, he made up nonsense about the cost, how can the secret of 'Lockheed' be told at will.

"It's me who is blinded by interests!"

After Byrne said this earnestly, he no longer wanted to subscribe to the [Engineering] thing, and counted the soul coins with peace of mind.

Wait until Helo has collected all the soul coins into the [Flea Skin].

He just sat on the sofa, and Shi Shiran asked the old man.

"After the business is negotiated, let's talk about what we have to do."

"Hehe, it's not a big deal for me, old man, but it's a good thing for you."

"A good thing? So what do we have to pay? ”

Helok didn't think that under the premise of the tower's equivalent exchange, there was no need to pay for any good things.

"Come on, let's take a look at this."

The old man seemed to be prepared, and pulled out a piece of parchment paper from his sleeve.

When Heloh took it and opened him, a puff of black dust drifted through the air as the parchment roll unfolded.

Helo subconsciously held his breath and looked at the old man, his eyes full of questions.

The old man shrugged his shoulders, pinched a few pieces of dust in his hand, and explained:

"It's just mine dust, it's not harmful to the magician, and the soul energy will naturally expel them from the body.

This invitation paper is from the [Kania Mine], you can learn about it first. ”

"[Kania Mine]? Is it the mine where the demon was born? The one on the periphery of the imperial capital? ”

Byrne, who was holding his breath together on the side, couldn't help but hold his breath when he heard the name of the mine, and exclaimed.

"Is this cave famous?"

Although the old man said that there was no harm, Helo waved away the dust in front of him, and then asked as he looked at the contents of the parchment scroll.

But it wasn't Byrne who explained, he had only heard of the mine, and the old man pulled over a chair and explained to the two:

"Because it appeared on the plains on the outskirts of the imperial capital, this mine that was once defined as a forbidden place was quickly cleaned up by those old monsters who had been bored for hundreds of years.

The ore inside has also become a scarce resource, but when the ore is dug up and everyone lets down their vigilance, the gate of hell in the deepest part of the mine opens, and endless demons emerge from the door.

Although they were finally destroyed by the high-level magicians, the gates of hell could not be destroyed, and they would be reopened every once in a while, releasing the demons on the other side of the door, and the mineral resources in the mine would be re-enriched. ”

"On the other side of the door is the world of demons?"

"The upper floors of the tower have discussed that this kind of door connecting the two worlds is not uncommon in the empire, and there are even many small worlds that have been conquered and occupied by the empire, but that time there was some surprise."

At this time, Helo also finished reading the invitation on the parchment scroll.

Dear Sorcerer,

Hello!

The Higram Platinum Chamber of Commerce is honored to invite you to the Expedition Feast held at the [Kania Mine] on the 23rd of this natural month!

All the items obtained from this feast will be yours, and of course, you can also hand them over to the Chamber of Commerce for recycling!

For the magicians who participated in the feast this time, an additional standard small staff made of ghost needles and branches was also given.

We sincerely look forward to your arrival on time!

.....

【Higram Platinum Chamber of Commerce】, Nopas Branch!

.....

"[Seagram Platinum Chamber of Commerce]..."

Helo has heard that he is very famous among the rank magicians, and the president of the Chamber of Commerce is a grand magician, who wanders between the thirteen towers, and his connections and financial resources are very terrifying.

"So what should we do?"

Harrow looked up and handed Byrne the invitation while he listened to the old man.

"Because the [Kania Mine] is too special, the gates of hell cannot be opened from our side, and to counterattack back, we need to seize the moment of opening the door, but the number of demons swarming out when opening the door is too large."

"Can't you use powerful soul magic to directly sweep away those demons, a few grand dukes should be able to do it together, right?"

Helo gave his opinion.

"Yes, but no! [Kania Mine] is located under the Imperial Capital Plate, and the powerful soul magic will collapse the plate, causing a part of the space in the Imperial Capital to collapse. ”

Helo understood what the old man meant when he said that the space collapsed.

If it's just for ordinary citizens, the tower doesn't care.

So what this space refers to is...

"Will the tower collapse because of this?"

The old man nodded heavily, then shook his head again.

"The space in which the tower is located is already fixed, and it will not collapse, but it will affect some floors, but even if it is only a few floors, it is a heavy blow to the tower, and it will take a long time to repair.

And more importantly, the spatial instability caused by the collapse of the plate is random, which tower will be affected, no one knows, the tower seems to be immobile, but in fact, every once in a while, their position will be rotated, which is also to prevent outsiders from locating. ”

Helo understood this.

No tower wants to be the culprit.

If you are him, why did my house collapse and then share the benefits?

Even if I distribute an extra part of the benefits, the unknown resources on the other end of the door may not be as valuable as my collapsed.