Zhou Ran had a little impression of this kind of small crossbow tower, which had no effect on powerful warriors, but it was definitely one move to deal with miscellaneous soldiers, and if the angle was good, it would not be a problem to even wear three or four moves.

It's a pity that there is no way to buy crossbow arrows, you can only find a way to forge them.

However, Zhou Ran firmly believed that with the early artifact of the assembly line, plus the three or four primitive people who had cultivated it by himself and had a bit of forging ability, if they wanted to copy this simple crossbow arrow, it would take a few days at most, so Zhou Ran waved his hand again and simply bought 30 small crossbow towers.

After buying all the two buildings and spending more than 1,000 wind crystals, Zhou Ran looked at the remaining crystals and stared at the last thing.

It is a small stone with a green Ouroboros symbol on it.

[Small Time Runestone: Special prop, specify a certain level of a building that is not higher than the Celestial level, and use a small time rune, the time inside the building will be 3600 times the normal time flow rate, and it will be maintained for 5 minutes. Runestone can only be used once, speeding up the flow of time without causing any damage to the creatures within the building. 】

This is the last thing Zhou Ran saw correctly, and the effect of this thing is also very strong.

For example, Zhou Ran used the center of the town to train totem warriors at this time, and each totem warrior needed to spend an hour or two, and he didn't have that much time to wait.

But if you use this small time rune stone to accelerate, 3600 times the flow speed is equivalent to, one minute of normal flow rate, and a day will be spent inside, then after a total of 5 minutes of time has passed, it is equivalent to 5 days, and he can summon more than 100 totem warriors out of thin air.

But Zhou Ran's fancy to this time rune stone is not the case, the combat effectiveness of more than 100 totem warriors, it is also on top of 200 tide chasers, or tide chasers, there is no substantial gap at all, he wants to use this time rune stone on the assembly line.

That's right, this small time runestone, although it limits the upper limit level of the building, but it does not limit the lower level of the building, theoretically as long as the building is recognized by the death game, it should be effective.

That is to say, he can spend 5 minutes to let the assembly line produce 5 days of work, you must know that Zhou Ran's assembly line, after he went to the ancient ruins, after returning from the ancient ruins after two upgrades, now the output is greatly increased compared to before, and even can produce more kinds of things.

In the past, the most was to produce small carts and forge those armor of average quality, but now not only the forged armor is more refined, but even the quantity has increased significantly.

At the end of the day, 20 pieces of full-body armor start, 50 pieces of half-body armor, and at least 100 pieces of ordinary weapons are the base, if it is like a spear, it is very simple to forge, and the weapons that consume fewer materials and steps are even five or six hundred pieces a day.

Zhou Ran waved his hand in mid-air, and then pointed to the props next to him, which had just been exchanged, and sure enough, after a while, a few primitive people ran over, they pushed small carts, and all the simple traps were built on them.

As for those quick buildings, Zhou Ran asked them to bring to Bai Zhu, Bai Zhu is now observing the virtual sand table, and he knows better than Zhou Ran where these buildings should be placed.

But before that, Zhou Ran took a small crossbow tower, and came to the position where he flew back before, and threw the plastic ball of the small crossbow tower directly on the ground.

The next moment, a crossbow tower with a height of about 6 meters and a metal crossbow arrow glittering with cold light appeared in front of Zhou Ran.

Zhou Ran went around to the back of the crossbow tower, and climbed up the ladder, the space above the small crossbow tower was not much different from the ordinary watchtower, but the small crossbow took up a lot of space, and there were a few boxes loaded with crossbow arrows next to it, so the space was obviously missing.

Zhou Ran placed a crossbow tower here, not for other reasons, but he wanted to take this opportunity to take a few crossbow arrows and see if he could find a way to forge them.

With his own and the few craftsmen he had trained, it might take him a day or two to crack the bolts.

And during this time, those primitives must have already attacked, but now with the Time Rune Stone, it is different, the price of a Time Rune Stone is 600 Wind Crystals, plus 5 materials with the aura of heaven and earth.

The former is sufficient, and the latter Zhou Ran obtained some in the small world of the Golden Clan, as well as the ancient ruins, he picked out some useless materials, and exchanged them for a total of two time runes, that is, it can take 10 minutes to exchange for 10 days of extra time for him.

Zhou Ran plans to spend all this time on cracking crossbow arrows and producing crossbow arrows, but don't underestimate the small crossbow arrow tower.

Zhou Ran has tried it after going up just now, this thing is divided into two ways: single point attack and continuous attack, the former has a long attack distance, high accuracy, and can kill the enemy in seconds with one move, while the latter has a strong range and can achieve long-range suppression.

30 small crossbow towers, enough to surround the inner circle of Zhou Ran's territory, if you can provide a sufficient number of crossbow arrows, let those tide catchers throw spears, to be responsible for single-point kills, these crossbow towers are all switched to continuous attack mode, absolutely able to suppress those primitive people, but in this way, the number of crossbow arrows consumed will reach a huge amount.

If you use the continuous attack method, the small crossbow bolt will consume at least 120 crossbow arrows per minute, and 100 crossbow arrows will not even be enough to support it for a minute.

Zhou Ran was still very prescient, since he had decided to crack the crossbow arrows and produce them in large quantities, before he entered the assembly line factory, he asked Bai Zhu to help summon a large number of lords.

They pushed carts of metal ingots and wood into the workshop, and the difference between the time outside and the time inside the factory was 3,600 times.

If in the process of production, if you find that the materials are used up and want to take them, go outside for a circle, even if it takes a minute or two, you can mobilize it, but it is equivalent to wasting a day or two of time.

Zhou Ran called those craftsmen and instructed the assembly line to make every effort to produce spears next, while he and the craftsmen began to study the forging method of crossbow arrows.

Before that, though, he had designated his own factory and used one of the small time runes.