Chapter 81

Lin Yifan pushed open the door of the synthesis room, a faint smell of mixed metal and wood came over him.

In the center of the room stood a huge workbench, with various tools and materials scattered on it.

Several blueprints hung on the walls, densely marked with various symbols and data.

Lin Yifan couldn't understand most of those symbols and data, but he didn't need to; he just needed to know how to use them.

He walked up to the workbench and carefully examined the synthesis room's interface.

The interface showed various items that could be synthesized and the required materials, including wood, stone, and cast iron.

Lin Yifan eagerly tried to synthesize some basic items to see how they would turn out.

He chose to synthesize intermediate wood, one of the materials needed to upgrade the shelter.

Another reason was that he didn't have much basic material left; most of it had already been exchanged for contribution points last night.

He only kept some basic wood for the fire, but the amount was small—only twenty or thirty units.

However, this time he wasn't trying to synthesize a lot of material; he just wanted to understand the synthesis room, so this amount was enough.

At that moment, a string of information also appeared on the city's panel.

【5 basic wood can be synthesized into 1 intermediate wood!】

【Now there are 25 basic wood, can synthesize 5 intermediate wood, synthesize?】

According to Lin Yifan's original expectation, two basic materials synthesize into one intermediate material.

Unexpectedly, it actually takes five basic materials to synthesize one intermediate material.

This synthesis ratio is really too high!

But now, does Lin Yifan have a choice?

He basically had no choice, so he could only agree.

Lin Yifan placed the required wood on the workbench above the synthesis room, and at that moment he suddenly realized the workbench looked very familiar.

He quickly walked out of the room, went to the living room and looked—sure enough, he saw the workbench he had previously built and placed in the corner, which was now gone.

"The synthesis room can actually automatically combine the workbench into an integrated unit? That would save some space."

Lin Yifan muttered that, then walked back into the synthesis room and activated the "Synthesize" option.

Soon, a soft light shone on the workbench; the materials gradually merged in the light, eventually forming a complete light orb, which then fell into the output slot below.

【Synthesis successful!】

Obtained 【Intermediate Wood】×5

"Success!" Lin Yifan excitedly picked up a piece of intermediate wood and examined it closely.

This piece of wood is much harder than basic wood, its grain has changed, and its color turned dark red, like rosewood.

In any case, judging by color or texture, it is clearly more suitable for construction.

Next, he also tried synthesizing intermediate stone and intermediate clay, with equally satisfactory results.

Lin Yifan secretly rejoiced; with this synthesis room, he could gather the materials needed to upgrade the shelter more quickly.

However, what gave Lin Yifan a headache was that he suddenly realized that, after all that effort to finally build the synthesis room, its level was only primary.

And a primary synthesis master can only synthesize basic materials into intermediate ones; to synthesize higher‑grade items, the synthesis room's level must be raised.

Lin Yifan wanted to upgrade to a silver‑grade level‑4 shelter; besides needing a large amount of intermediate materials, he also needed 50 units of advanced cast iron.

So far he hasn't obtained any advanced cast iron, showing that this grade of material is absolutely not something easily acquired at this time.

The only thing he could rely on was upgrading the synthesis room! This made Lin Yifan slightly annoyed.

He opened the synthesis room's information.

【Primary Synthesis Room】

Upgrade materials:

Initial Copper ×100

Intermediate Cast Iron ×150

Intermediate Wood Material ×500

Intermediate Stone ×500

Fire Spirit Essence ×5

Lin Yifan gets a headache just looking at these materials; not to mention anything else, just mentioning Fire Spirit Essence.

Except for that time when he opened six Rough Stones from a blue Treasure Chest and obtained two Fire Spirit Essences from them, he had never seen this stuff before.

Moreover, the only reason he managed to open six Rough Stones that time was because he had the 【Item Critical Hit】 buff active that day.

Otherwise, even a blue Treasure Chest could only yield one Rough Stone, let alone the fact that these Rough Stones are called 'rough' precisely because they still have an outer shell!

No one can guarantee what attribute the Spirit Crystal inside the stone shell has, and it's actually hard to guarantee whether the Rough Stone even contains a Spirit Crystal at all.

Just this one thing could make Lin Yifan go bald!

Moreover, upgrading also requires bronze!

Although all that's needed is 【Initial Bronze】, Lin Yifan has never obtained this material from any Treasure Chest so far.

There are some on the Trading Hall, but even if you bought them all, you'd still be short by 80 units.

Wanting to upgrade the Synthesis Room to Level 2, just gathering these materials is no easy task.

It seems that the Level 4 Shelter is still far off!

However, Lin Yifan hasn't lost heart; just from reading the blueprint's description, one can see that the Level 4 Shelter is a small two-story standalone building.

Moreover, among the required materials, even 【Advanced Cast Iron】 is needed, showing that the shelter built will have absolutely high safety.

Good things come with hardship!

Lin Yifan temporarily set aside his disappointment, because he still had more important things to do.

He took out from his Space Ring the pile of Iron Ore he had dug up by the roadside yesterday.

Previously there was no synthesis room, so there was no way to synthesize iron ore into cast iron.

Now that we have a synthesis room, this problem can actually be solved.

Lin Yifan placed all the iron ore on the workbench, then began processing.

"Hummm..."

The synthesizer emitted a faint mechanical operating sound, and that pile of iron ore was quickly devoured by the machine.

Shortly after, a heap of iron chunks the size of fists spewed out from the outlet on the other side.

【Intermediate Cast Iron】 ×65

Lin Yifan saw that pile of iron chunks, and his eyes lit up instantly!

He actually synthesized Intermediate Cast Iron directly, rather than the primary grade, which genuinely surprised him.

But upon further thought, it actually makes sense!

Lin Yifan already had some Primary Cast Iron in his hand, so after digging up that pile of iron ore, he compared it with the finished cast iron.

He found that for the same size, the iron ore weighed more than the cast iron, which was indeed unusual.

Now it appears that this batch of iron ore he discovered has a very high iron content, which is why it could be directly synthesized into Intermediate Cast Iron.

And the Intermediate Cast Iron he needs is still short by over 200 units; if he used Primary Cast Iron to synthesize, he would need nearly 800 units.

So far, aside from the iron ore he picked up this time, all of his Primary Cast Iron has come from opening treasure chests.

800 units of Primary Cast Iron—how many treasure chests would he have to open?

He must find a way to locate this iron ore!