After ten minutes.

Su Ye completed four transactions.

Three of them are 5 zombie crystals.

One stroke is 4 zombie crystals.

Consumes 19 Zombie Crystals in total.

Su Ye harvested 4 Guardian Beast Runes, plus 15 Iron Body.

There were also people who traded with Su Ye one after another, and Su Ye sent the information that "the resource has been traded" one by one.

This time the transaction is not successful, and there will be opportunities to trade in the future.

Wood: 174

Stones: 81

Iron Body: 71

Zombie Crystal: 20

Botanical imprint: 1

Mechanical Marks: 2

Guardian Beast Mark: 4

Mark of Light: 0

Hawkeye Archer (green): 4

Miner blueprints (green): 2

Genetic Medicine (green): 1

...

By exchanging resources, you can make your own resources more reasonable.

"Four guardian beast marks can build two fifth-order eagle-eyed archers again."

"Or let the fifth-order Hawkeye Archer be promoted to the sixth-order."

For a while, Su Ye was in trouble.

If you build more eagle-eyed archers, you can make the front line wider.

It is easier to hold the defense line of more than 50 meters.

after all.

Su Ye currently has only two first-order pea shooters, four fifth-order ordinary archers, and two fifth-order eagle-eyed archers on the left side of the city wall.

Add two more eagle-eyed archers, and the area covered by the attack will be wider.

Promoting an eagle-eyed archer to Tier 6 is similar to building a Tier-5 eagle-eyed archer.

However, it is faster to shoot giant zombies.

After thinking about it, Su Ye decided to take a compromise.

Four guardian beast marks, two used to build a fifth-order archer.

Two are used to upgrade the Hawkeye Archer to Tier 6.

"I need to use Iron Body too."

"One that can be summoned is one."

"That way, I'll have a lot less stress."

After thinking about it, Su Ye spent 40 Iron Body and traded two more Guardian Beast Marks.

After some operation.

Su Ye summoned two new eagle-eyed archers, but they were all first rank.

Wait until tomorrow, or even the day after tomorrow, to be able to advance.

At this time, Su Ye's resources were also consumed a lot.

Wood: 164

Stones: 81

Iron Body: 21

Zombie Crystal: 10

Botanical imprint: 1

Mechanical Marks: 2

Guardian Beast Mark: 2

Mark of Light: 0

Hawkeye Archer (green): 2

Miner blueprints (green): 2

Genetic Medicine (green): 1

...

The remaining guardian beast mark was used by Su Ye to advance the fifth-rank eagle-eyed archer to sixth-rank tomorrow.

After carefully inspecting the resource dealer and confirming that there is no major problem, Su Ye is relieved.

Currently, there are more wood and stones.

And this is precisely the key resource for Su Ye to resist zombies when the zombie tide arrives tomorrow.

Those ordinary zombies, Su Ye can shoot and kill with the firepower of guardian beasts and pea shooters.

And the giant zombies that can resist for a few minutes, as well as the possible deformed zombies.

Su Ye needs to rely on building a city wall outside to attract their attention and delay the time as much as possible.

Of course, if the eagle-eyed archers who are promoted to the sixth rank and the fifth-rank archers can quickly deal with the giant zombies, it is naturally better.

"A day or two before the dark tide, the number of dark creatures will not be too exaggerated."

"And that just gave me a day or two of buffer time."

"Wait until the third and fourth day, not only zombies will appear, but also some other dark creatures, such as Specter, Wraith, Banshee, Werewolf, Blood Race, Ogre, Orc, etc. Mixed in the army of zombies."

"It's a pity that I don't have enough Iron Body resources. Otherwise, I can build a four-meter-high, but six-meter-high steel city wall. At that time, the completeness factor will go up a notch."

In the dark world, the construction of tower defense walls mainly consists of four steps.

The first step, wooden tower defense.

The second step, the stone tower defense.

The third step, steel tower defense.

The fourth step, titanium tower defense.

It is said that there is also a "steam tower defense" of the fifth step.

In Su Ye's memory, he has only heard of it in some biographical rumors.

It is said that it is in the depths of the distant dark country, where the technology of machinery has developed to a very high level, entering the era of steampunk, and various steam machines with vitality have been forged.

Even humans do not need to take action, these steam machines themselves will go deep into the darkness and kill all kinds of dark creatures, bringing rich survival materials to human beings.

At present, human beings are in the time period of steel tower defense.

In historical parlance, it was the "Iron Age".

The tower defenses of large cities are made of steel tower defenses built with Iron Body and some other materials.

With such a defense, even if the giant zombies get under the tower defense wall, the steel city wall can resist them for a long time.

Even if the aberration zombies attack the city, the city wall is thick enough, and it can still resist for a few hours.

This is unimaginable in the "Stone Age" when the city walls were built with stones.

It is said that in the older "Wooden Age", humans could only survive in caves.

And for Su Ye.

My own stone city wall, which is a relatively primitive "Stone Age", is not enough to resist the attack of a large number of zombies.

Fortunately, Su Ye has a system and has a high-level guardian beast that others can't match.

And this is also the most powerful guarantee for Su Ye to survive in the dark world.

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