"A copper mine? Why not just exchange it for pure copper, which is very expensive?"
"Well, pure copper is a metallic material and costs 50 times more! Taking copper ore directly back to the city and smelting it yields the most metal and is highly variable.
Furthermore, most of our current copper is mainly used to forge city walls, build hidden defenses or to expand the Holy City.
The walls only need to be 50% copper to insulate them from 'life outside the city', so there's no need to use pure copper, instead, by incorporating other metals or special stones at 50%, we can greatly increase the hardness and toughness of the walls. "
"Smelting techniques, sounds like it's very developed."
"There are specialized alchemy teams in the Holy City, so smelting metals isn't a difficult task."
"Alchemy, " this was the second time Han Dong had heard this term, if he returned to school this time, during this semester if Mr. Black and White did not have any special arrangements, using his free time Han Dong planned to engage in a side business.
After all, Han Dong was different from an ordinary trainee knight.
In addition to his needs for food, clothing, housing and transportation, he also needed extra finances, thus to support this 'special head'.
Of course, Han Dong himself was also interested in the special science of this world.
It was quite good to engage in a hobby to relax after making copies and killing monsters.
--------------------------
"Is that the difference in benefits from the difference in difficulty?
Replacing the brass, I still have thirty points to exchange, Let's see what's there first."
In addition, Han Dong had another doubt.
That was, if it was feasible to take all the points to exchange for brass and then take them to the Holy City and use them directly as currency? That's a lot of money.
Cass immediately vetoed it.
"Brass and copper coins are different.
The value of a brass coin is much higher than its own copper content, and as a type of currency in circulation, it is manufactured and issued by the [Holy City Vault] under the council's name.
The copper metal is of great importance to the Holy City.
The copper coins were a way to remind the people of the importance of brass, the amount of brass spent on the production of the copper coins was not that high.
The copper content of a coin is limited to about 30%, and the total quality of the coin is not high either.
Its monetary value is mainly achieved through a special manufacturing process and by having a non-forgeable seal printed on the front and back of the copper coin."
"So that's how it is!" Han Dong nodded his head.
Cass continued, "And even if we bring brass back for a lot of money, but the [Trading Center] offers limited items.
In the Destiny Space, however, points can be exchanged for anything.
Yes, anything, as long as you have enough points, you can exchange them for anything.
And, only those who survived the Destiny event can come here once!
With only half an hour to redeem at a time, the opportunity is precious, like we've all prepared in advance, we'll be able to redeem what's best for us if we make it through alive this time."
Han Dong followed Cass' teachings and reached out to touch the surface of the shell similar to a Dyson ball.
A three-dimensional projection of the screening interface was projected in midair, divided into six categories.
When Han Dong saw such a high-tech projection interface, he was further certain that this Dyson Ball-like object was by no means a product of the current world.
It also made Han Dong begin to speculate about the origin of the Destiny Space.
"A means left on Earth in advance by some future higher civilization that spied on the terror and potential danger of 'life outside the city'? Go back and ask Mr. Black and White, there's no point in me guessing here."
First, he found the brass through the search engine and spent 10 points in exchange for a ton of brass to use for the delivery.
Next, with only thirty minutes left in the time limit, Han Dong began to quickly look up the relevant broad categories.
It was indeed as Cass said, nearly everything could be exchanged here, and the [Equipment] column was clicked open, which needed to be filtered by quality and category (weapons, helmets, hands, etc.).
The corresponding equipment would be arranged from low to high by the price of points, dazzling Han Dong.
The price of a piece of green quality equipment was around 20~60 points range.
Blue fine equipment, on the other hand, was priced at least in the triple digits.
Expensive, it was definitely expensive.
By this calculation, as a trainee knight, Han Dong would have to pass through the Destiny Space three times normally to have enough points to redeem the blue equipment, Of course, there were also some special bonus Destiny events that might be rewarded with points.
But there was an advantage here.
The various branching scenarios of the Destiny Events gave equipment rewards that are basically random.
And here, as long as you have enough points, you can exchange them for the most suitable equipment for yourself.
Han Dong then clicked on the [Books] category, which belonged to a category that Han Dong was unclear about.
Inside it contained all sorts of magic books, secret books, and even books from which one could obtain demonic powers.
Han Dong also flipped to something very interesting, cultural martial arts belonging to his own country, or even cultivation secrets that had only appeared in some novels.
The prices of basic martial arts weren't very high, about 20 points could be bought.
As far as cultivation secrets were concerned, the cheapest ones started at 500 points, and the quality was blue or above, Han Dong would ignore them for now.
Although Han Dong's body wasn't very good, he didn't intend to buy a body refining book to train his own flesh, the body only needed to be replaced gradually to improve, so there was no need to train it himself.
Moreover, Han Dong currently had an 'obscure' book on him, and he had no time to learn anything else at the moment.
The [Living Things] column was what Han Dong valued more.
Within it, one could also look up a thousand strange and unusual beast beings.
Even some magical and fantasy creatures were basically there, all types of magical beasts, from small lava dogs and wind wolves that were similar in size to ordinary canines, to dragons, behemoths, and giant sea monsters.
Of course, there were also many humanoid races, such as elves, trolls, half-bodied orcs, and so on.
Such humanoid beings were not only expensive and limited to purchase (one needed to reach Seed Sprout and Knight stage to purchase such humanoid beings).
Some trainee knights of the 'control system' should be able to exchange living creatures here.
Han Dong stared at an expensive living creature, not interested at all, if he wanted one, he could just go to the Destiny Space and grab the ready-made ones.
Chen Li and Togo were by no means inferior to these living creatures in terms of potential.
As for the subsequent consumables and materials, there were also many things that interested Han Dong, such as a potion for living and dead human flesh and white bones, or a potion that could instantly replenish energy, enough to solve many dilemmas, but the price was not something Han Dong could currently afford.
Han Dong wasn't clear at the moment, and 30 points couldn't be exchanged for anything too good, so he was going to save it for the next use.
Han Dong, who had exchanged a ton of copper ore, returned to the [Clock Tower].