Vice Principal Yao personally took Fang Yu to the school supermarket, and after meeting with the salesperson, the latter opened the back door of the supermarket.

Under the leadership of Vice Principal Yao, Fang Yu walked into this seemingly ordinary back door, only to find that there was actually a hole behind the door.

It seems to be a treasure room, surrounded by wooden shelves with a variety of materials and artifacts, with detailed notes and prices underneath, and the quality is significantly higher than the ordinary goods outside.

"I think you are a very assertive person, so the choice is up to you, just go to the front to register and pay the bill after choosing." Vice President Yao was very open-minded.

Fang Yu was a little flattered: "Can you choose anything?" ”

"Of course." Vice President Yao said with a smile: "There is also an intelligent screening system here, you can log in with your student ID, it is very easy to operate, you can choose slowly." ”

After saying that, he turned around and left.

As the iron door behind him closed, the surroundings were plunged into darkness, and then countless colorful lights began to light up.

These rays of light were emitted by various magic weapons, and at a cursory glance, there were no less than thousands!

Magic weapons with different attributes often have differences in color, for example, most of the fire attribute are red, and most of the water attribute are blue.

The colorful light renders the entire chamber beautiful.

Seeing that there was a computer next to him, Fang Yu changed his way and entered his student ID, and then began to search for "Blood River Nautilus".

This thing was instructed by Lu Tian's senior to find it, Fang Yu had always kept it in mind, and he just took this opportunity to try it.

The results of the search came out quickly, Fang Yu's luck was good, in this secret room, there was really a "Blood River Nautilus".

According to the prompts of the system, Fang Yu found this "Blood River Nautilus" on the wooden shelf in the corner, and from the appearance, this is a palm-sized conch.

The surface of the conch is blood-red with snowflake-like white spots on it, which is very beautiful.

And the strange thing is that from the mouth of the conch all the time spewing red mist, exuding a faint trace of blood, like the tide of ups and downs, if you put the conch to your ear to listen, you can also hear the sound of the tide.

Next to it, there is an introduction and price tag about the "Blood River Nautilus", this thing is inconspicuous, and it is actually priced at 150,000 spirit coins, and the introduction is that the blood river inside can hide its tracks, dissolve the seal, and also has the function of mustard seed Sumeru.

Fang Yu didn't expect this thing to be so expensive, but since it was Lu Tian's predecessor who wanted it, there was nothing to say.

Next, he turned his attention to some special natural treasures.

According to what Lu Tian's predecessors said, when the "Spirit Divine Formula" opens each palace, if it can integrate the treasures of heaven and earth into it, the effect will be earth-shaking.

Regarding this point, Fang Yu had also experienced it firsthand, the first palace Fengfu Palace was integrated into the Horn of Listening to the Truth, the second palace was integrated into the Eye of Bai Ze, and the third palace Baihui Palace was integrated with the Arctic Sword Spirit, each palace brought a rapid change in his strength.

And now, he has touched the door that opens the fourth house, and he needs to prepare in advance.

He entered his requirements into the system, emphasizing that it was best to be metallic, and after the system was screened, a total of seventy-eight options were given, all on one shelf.

This is the best, you can save the trouble of looking for them one by one.

Fang Yuxin didn't go to the corresponding shelves, most of the things placed here were some special ores, weapons, or the teeth and bones of alien beasts.

Fang Yu used the metal element induction technique to roughly sense it, and sighed silently in his heart, these things seemed to be inconspicuous, but each of them contained a massive amount of metal aura.

With so many good things in front of him all of a sudden, Fang Yu couldn't help but feel excited, and carefully picked up a few ores and put them in the palm of his hand to play, only to feel that each one contained a majestic aura, as if it would burst out if he was not careful, making him feel terrified when he held it in his hand.

He thought carefully about his current situation, the body content has the Arctic Sword Spirit and the Big Dipper Seven Swords, and the attack power has been completely guaranteed, so the blade is not within the scope of his selection, and he should focus on some special functions in order to enrich his combat mode.

After a while, he picked out two of the treasures that he thought were more suitable.

The first was a dull gray coarse piece of ore, faintly red from the inside, and it felt hot in the palm of your hand, as if there was a fire burning inside.

This ore is called "Golden Essence Glazed Flint Stone", which exists in the magma of volcanic eruptions, is extremely rare, and sells for 150,000 spirit coins.

It not only contains a large amount of tungsten manganese gold essence, but also contains a special glazed fire, which can burn the impurities in the oxide metal element, which is the most suitable for quenching metal.

Although Fang Yu is currently majoring in sword mastery, since he is a metallic ability, he will definitely be involved in metal smelting and magic weapon creation in the future, so it is also appropriate to make some preparations in advance.

The second is a flower, but unlike ordinary flowers, this flower has no branches or leaves, as if it grew out of thin air.

Its petals had a bright silver metallic luster, as if it had been smeared with a layer of mercury, Fang Yu tried to take it, only to feel that it was heavy to start, a flower the size of half a palm, the quality of which was more than twenty kilograms, to say the least.

This flower is called "Lead Mercury Flower", which is a strange flower that blooms in mercury in a special environment, and its biggest feature is that it can change between solid and liquid state at will, and it is also biologically active, which is useful in some special cases.

And its price is as high as 200,000 spirit coins, and it is still above the "Golden Essence Glazed Flint".

Fang Yu was very interested in these two things, at present, he still had 350,000 spirit coins left, enough to buy any one, if he gritted his teeth and bought it together, it would be barely enough, but in that case, he himself would become a poor egg again.

Fang Yu took the "Golden Essence Glazed Flint" and the "Flower of Lead and Mercury" in his hand, and after thinking about it carefully, his heart gradually began to lean towards the "Flower of Lead and Mercury".

After all, he won't learn the art of metal smelting and magic weapon forging in a short period of time, so the "Golden Essence Glazed Flint Stone" can wait until he has money to buy it later.

However, just as he was about to make a decision, there were suddenly several "crackling" sounds overhead, as if a stone had been thrown on the calm surface of the lake, and a circle of translucent ripples rippled in the air.

I only heard the sound of "crackling" continue to come, and there seemed to be sparkling electric sparks above Fang Yu's head, and a rusty copper door gradually appeared in the air, with a desolate and heavy aura......