Jiang Yiyi and Zhao Jiayan also helped sort the supplies. They didn't have many supplies. They mainly counted the spirit cores. These were their main assets.

"This paper is wet and seems to be unusable. Could the strange object still be damaged?"

Zhao Jiayan picked up the 'reply receipt' and said doubtfully.

Yang Yuan glanced back: "This paper itself shouldn't be a rare object, it's just something made by a rare object. If it breaks, throw it away, or keep it for wiping your butt."

However, Zhao Jiayan was not willing to throw it away, and she also collected the soaked receipt.

At this time, Yang Yuan looked back at the direction they came from.

In that direction, Hanbao was always moving unconsciously towards the water, although the speed was not very fast. Perhaps it was just a subconscious movement and it did not speed up deliberately.

But the other party is always moving forward, getting closer and closer to them.

But now they are trapped here.

If the drought demons come within a hundred miles, can the cooler save them?

Maybe, but their food won't last long and they can't spend it here for a long time.

A solemn look flashed in Yang Yuan's eyes, he withdrew his gaze and looked at the experience data of the Firepower Frisbee:

[Cruising Unmanned Firepower Frisbee lv.6:3674/960 (upgradeable)]

The current experience is enough to upgrade Fire Frisbee to level eight, but it is not enough.

Far from enough!

It is best to be able to upgrade the Fire Frisbee to level 11 in one go, reaching the rare object level.

In this way, the certainty will be greater.

In short, the longer it takes, the better.

"The shells that have been consumed cannot be recovered..."

Yang Yuan tried to use experience to restore ammunition, but found that it didn't work at all.

When the previous power armor is incomplete, it can be repaired with experience, but that is only when it is damaged.

But the current Firepower Frisbee is not in a damaged state, because the artillery shells and the Firepower Frisbee belong to two different things in his concept.

Missing shells is not considered incomplete, it has nothing to do with damage, and naturally cannot be repaired.

Perhaps Zhao Jiayan's ability could restore the cannonball to full capacity, but the original prototype's firepower frisbee made Zhao Jiayan sleep for a day and a night.

Today's firepower Frisbee is so big, even if it only recovers a few shells, it probably won't be able to drain Zhao Jiayan dry.

After all, the other party has only been awakened for a few days, and the other party is not him, so the upgrade speed cannot be that fast.

"It seems that we have to save these shells as much as possible in the future. This firepower flying disc was made specifically for killing the Drought Demon!"

If nothing else goes wrong, the next time you upgrade, the cannonballs will not be completely full, but will double the existing number.

From this point of view, the firepower flying disc can be regarded as disposable to a certain extent. After the shells are fired, it can only be used as a mobile base.

After all, when the firepower Frisbee reaches level 10 or even level 11, the size of the shells will be frighteningly large. Today's humans should not be able to make such large shells.

Suppressing the urgency in his heart, Yang Yuan said to Zhao Jiayan and Jiang Yiyi: "You guys go to bed first. I will keep vigil tonight. I won't have any problem even if I don't sleep for several days and nights."

Zhao Jiayan glanced at the densely packed strange figures thousands of meters away, and asked with some worry: "Those things are still watching eagerly. Although they may not be able to get out, it's better to be careful. So I think we should not sleep, either.

It’s impossible to sleep. We are both psychics now, and I have almost recovered. If I don’t sleep all night, there won’t be any problem.”

Yang Yuan thought for a while and nodded: "That's okay, let's do this. You can help Yiyi get some crossbow arrows and let Yiyi practice accuracy to pass the time."

He wanted to see if the arm crossbow's range would be increased indefinitely after its level was raised, or if it would produce an explosive effect like pistol bullets.

"Okay." Zhao Jiayan naturally didn't have any objections, since there was nothing to do anyway.

"Look for some materials and enter the safe house to make them. Don't stay outside. You can turn on the LED lights. Now we don't have to be afraid of ordinary alien beasts, and ordinary alien beasts here may not dare to come to this ancient ruins." Yang Yuan warned.

"Yeah." Zhao Jiayan nodded and looked for dead wood nearby.

There are so many dead branches that have not completely decayed in the leaf rot layer that there is no need to go far.

And Yang Yuan didn't waste time. He moved the remaining cooler parts into his cubicle, turned on the LED lights, and sat on the bed in the cubicle to concentrate on assembly.

The ones that were originally put into the box were assembled, but they were blown away by the wind.

Now you can no longer gain personal experience by assembling ordinary items, but these coolers can also be kept for upgrading. They will still give you personal experience when they level up.

It took more than three hours, and by late at night, these coolers were assembled.

More than three hundred in total.

Yang Yuan moved all these coolers into a box more than ten meters away and soaked them in water to gain experience.

If you upgrade all of the more than 300 coolers to level 11, you can add more than 300 personal experience points to yourself.

'By the way, that cooler that has reached Level 10 needs to be restricted, otherwise it will accidentally create a tornado. Even if I am made of iron, I cannot withstand such a torment.'

When Yang Yuan thought of this, he immediately took out his short knife, found a thicker tree trunk nearby, and whittled it into wooden boards.

Then he cut these wooden boards into squares, created a mortise and tenon structure, and assembled them into a palm-sized wooden box, which could just fit the cooler.

Because I was not familiar with the mortise and tenon structure, it took more than an hour to make a wooden box that could hold things and had a removable lid that could be closed.

[Wooden box lv.1:0/1 (shoddy wooden box)]

'The initial experience is only a little, but it is convenient for upgrading quickly.'

Yang Yuan looked at this rough wooden box that he had 'carefully made', trying to close the lid, open it again, and then close it again.

However, experience has not increased.

He thought for a while, picked up a piece of sawdust and put it in, then closed the box, then opened it and took out the sawdust inside.

In this way, the experience of the box increases a little.

'Is experience calculated based on the number of times again?'

Yang Yuan smiled. He liked this way of gaining experience.

Immediately, he kept putting the sawdust in, closing the lid, then opening the lid, taking it out again, putting it in again, taking it out again...

Repeat this operation.

Each reincarnation, the wooden box can add a little experience.

In just ten minutes, the experience of the wooden box increased by more than a thousand.

'Tsk, tsk, the speed at which you gain experience... is so cool.'

With a thought, Yang Yuan directly upgraded the wooden box to see if it could isolate the temperature control radiation of the cooler after the level was high enough.

[Wooden Box lv.1:1719/1 (can be upgraded)]

…

[Wooden Box lv.2:1718/4 (can be upgraded)]

…

[Wooden Box lv.3:1714/8 (can be upgraded)]

…

[Fresh-keeping box lv.4:1706/8 (increases the shelf life of any food by one month; can be upgraded)]

The box has become much more refined, but this function...

"Keep it fresh?"

Yang Yuan was stunned for a moment, but decided to continue upgrading to see if he could achieve the effect he wanted with a higher level.

…

[Fresh-keeping box lv.5:1698/16 (two months...; can be upgraded)]

…

[Fresh-keeping box lv.6:1682/32 (four months...; can be upgraded)]

…

[Fresh-keeping box lv.7:1650/64 (increases the shelf life of any food by one year; can be upgraded)]

…

[Fresh-keeping box lv.8:1586/128 (two years...; can be upgraded)]

…

[Fresh-keeping box lv.9:1458/256 (four years...; can be upgraded)]

…

[Fresh-keeping box lv.10:1202/512 (increases the shelf life of any food by ten years; can be upgraded)]

Yang Yuan frowned slightly and decided to upgrade to another level.

Soon, the upgrade is over:

[Wonderful Item·Fresh Box lv.11:0/2 (increases the shelf life of any item by one hundred years; cannot be upgraded)]

【Experience 1】

My personal experience has increased a little again, and my level can be improved again.

So Yang Yuan upgraded his personal level first without hesitation.

The upgrade from level 11 to level 12 does not produce a qualitative change. The essence, energy, and spirit do not undergo the same big transformation as before, but the number of improvements is already large.

This is normal. Although this upgrade only requires two points of experience, these two points of experience are both obtained from rare objects and have different qualities.

【lv.12:0/4】
Chapter completed!