The city's water supply pipes also need to be laid, the construction of the elevated aqueduct makes the water supply of Zhenbeibao very convenient, and the purity of the river water that has been filtered through layers of sedimentation is also very high. There is another toxin-purifying property on the water supply system.

With multiple insurances, Zhenbeibao's drinking water is already very safe, and the water in the reservoir is transported to households through pipelines.

After all, such a water supply facility has to be maintained every day, and he doesn't plan to let people use it for free.

Suren also reserved a lot of vacant land in the outer city area, which was left for future development, and the Harvest Altar was a wonder building, which was difficult to build and cost a lot of resources, such as the earth spar to be sold to those wizards alone, and there was no problem with 500,000 jinnars.

The appearance of the harvest altar is somewhat like the Mayan pyramid in the previous life, the base is square, on the top is an altar, the altar is round, the whole altar is very large, fortunately it is now winter, there is no need to farm, so there are more people in Zhenbei Fort.

In order to build the altar as quickly as possible, Suren mobilized 4,000 men to build it, and in order to speed up the progress, Suren ordered Boulder and Johnson to attack the small tribes in the wilderness, then plunder the population, and then hand over these goblins, kobolds, and gnolls to the drow elves to be trained.

Winter is the most difficult season in the northern wasteland, and the northern wasteland will be covered with ice and snow for about a hundred days, and there will be no food at that time, and the vast majority of goblins and kobolds will not be able to resist, even those powerful centaurs. The orc tribe starves to death some of the old and weak every winter.

In fact, many goblins and kobolds would love to become slaves in Fort Zhenbei, and Suren only learned about this later, when the goblin servant Flor, who had sworn allegiance to him, told Suren that he had a way to get a large number of slaves for his territory.

Suren agreed to let him try, and then the goblin slave showed Suren a bit of a trick, first using his goblin identity to enter the goblin tribe, and then mingling with these goblins, and after getting acquainted with them, he told the goblins that he knew where to find food.

As a result, those goblins who wanted not to starve to death expressed their willingness to follow him and support him to become the leader of the tribe, and the result was simple, Flor directly took this group of goblins to the place where Johnson and Boulder agreed on them, and then easily arrested all the goblins.

After killing the goblin leader and handing over the remaining goblins directly to the drow elves for training, in just one week, the number of goblin slaves in Zhenbei Fort increased to 3,000, including more than 200 goblins and bear goblins.

In recognition of Flor's outstanding performance, Suren made an exception to exempt him from his slave status and made him an inferior citizen of Fort North. Goblins are not picky eaters, they can feed with a little leftovers, and Su Lun's territory is now full of food, so they naturally don't care about these, although the goblins have little strength, but the number can still make up for it.

The Harvest Altar requires a large amount of stone, and the requirements must be of the highest quality, and the stone that relies on turning mud into stone is not fully supplied. There weren't many places to mine stone in the wilderness, and Suren had bear goblins and goblin slaves go to mine stone, and the quarry was located in the same place where ogres had set up camp.

The quality of the rocks here is very good, fully in line with the construction requirements, the quarry is not far from the Baishui River, and the quarried stones can be transported directly to Zhenbei Fort by water transport.

In addition to these stones, the Harvest Altar also needs a lot of pure white marble, these marbles can only be mined in the Lotas Mountains, after the marble is mined, it needs to be further processed, the number of pure white marble is not much, Suren can only use fossils as mud to soften the marble, and then remove the variegated color inside, so as to get pure white marble.

The entire Harvest Altar is twenty-seven meters high and is divided into three tiers of nine metres each. There will be a variety of carvings on each layer, but fortunately, there are many carving craftsmen in the territory of Suren. In addition to these materials, a large amount of five-colored earth is required to build an altar.

Five-color soil refers to the pure natural soil of five colors: green, red, yellow, white and black. It is not difficult to find the five-colored earth, it takes some effort to find, in addition to these basic materials, the construction of the altar also requires a large number of inscriptions, fortunately, these inscriptions are not complicated.

In order to speed up the construction, Suren also made only a few simple machines, and with the skills to control the machinery, Suren did not take long to build some relatively primitive cranes, in addition to which there were some vehicles to transport materials. With these things, the construction of the altar was sped up a lot.

With the consumption of a lot of manpower, material resources and various resources, the construction of the Harvest Altar was very fast. A month has passed in the blink of an eye, and the weather has become colder and colder during this time, and there has been a heavy snowfall during this period, but fortunately, there is the Lotas Mountains in the north of Zhenbei Fort, which blocks most of the cold winds from the polar ice fields, otherwise it will become ice and snow.

The construction of Zhenbei Fort has not stopped, of course, in order to cope with the heavy manual labor, meat has been added to each meal, and the salted dried fish stored before has been taken out, many of those slaves and displaced people can't even eat enough, and now they can not only eat enough but also eat meat every day, even the cold wind outside can't resist their enthusiasm for eating meat.

In addition to the harvest altar, the city wall of the outer city of Zhenbei Fort is also stepping up construction, and the action of Zhenbei Fort to capture slaves in the wilderness has not stopped, and now Zhenbei Fort has taken the old and new to capture slaves.

Let the barbarian warriors lead a part of the recruits to act together, and when they encounter difficult bones, the barbarians go up to solve them, and those recruits follow behind to pick up cheap experience, and when they encounter those who are not strong, let the recruits come forward to brush up on experience, and the barbarian warriors press the formation.

Since the end of the battle of the troll tribe, Zhenbei Fort has recruited a total of one hundred and fifty recruits, as well as a hundred security guards, so that the speed of training recruits has been greatly accelerated, originally according to the requirements, it takes three months for a civilian to become a qualified recruit, but now after participating in the actual battle, the process has been shortened to two weeks, or even less.

The strength of kobolds and goblins is not strong, these recruits are equipped with wooden shields, spears, and inlaid iron armor, as long as the formation is formed, those kobolds and goblins are not opponents at all, and often collapse directly after two charges, of course, you also need to pay attention to the kobold warlocks that will appear in the kobold tribe.

Although these kobold warlocks will only release one or two spells, they are still a great threat, and in order to deal with this, Suren will send out the archers of the Spirit of War, who have successfully advanced to strong archers after the last troll war.

Knight-level strong archers, even if there are kobold warlocks, will be shot by bows and arrows at the first time, after all, there are few defensive spells awakened by kobold warlocks, among which flame arrows and burning hands are the most, and there are also awakened auxiliary bloodthirsty thaumaturgy.

With these monster farming experience, these recruits only need two or three battles to become qualified soldiers, and with this way of farming monsters, the recruits of Zhenbei Fort quickly become qualified soldiers. The one hundred and fifty recruits recruited one after another were still half archers and half pikemen, and a few of them who had killed more enemies had become elite pikemen or elite longbowmen.

After the battle, the soldiers of the security team successfully advanced to the guards of Zhenbei Fort, during this time, because of the population of Zhenbei Fort, things in the town suddenly increased several times, and after the security team expanded its scale, it was barely enough.

However, after recruiting a large number of soldiers, the expenses of the town suddenly increased several times, and these soldiers had to be paid thousands of gold narls every month. But this is also a good thing, these soldiers will definitely spend money when they have it, and in the next period of time, these soldiers will be the main consumer of Zhenbei Fort.

After the actual combat of the old and the new, the strength of the soldiers has been improved, the territory has obtained a large number of slaves, and the monsters around the territory have also been cleaned up, which can be said to kill three birds with one stone.

The number of slaves in Zhenbei Fort has increased by more than a thousand again, and now the total number of non-human slaves in Zhenbei Fort has reached more than 4,000 and is about to exceed 5,000.

In just over a month, including non-human slaves, the total number of people in Zhenbei Fort has more than tripled, and the grain harvested this year is almost just enough, so the arrest of slaves is finally over.

Su Lun was very busy during this time, but he still found time to go to the hatchery every day to look at those pterosaur eggs, maybe it was his luck, this batch of pterosaur eggs actually survived eleven, and only two pterosaur eggs became dead eggs. This hatching success rate is already called a rebellion, after all, the hatching rate of pterosaurs is only about half.

The two dead eggs Su Lun did not waste it, and directly threw it to the halfling to make food, during this time the halfling Frodo has been experimenting with various dishes, and it is naturally very happy to get the high-end ingredients such as dragon eggs, and after the evening, there are more dragon egg fried meat, dragon egg cakes and so on on the table.

After more than forty days of hatching, the remaining eleven pterosaur eggs are about to break the shell, Suren did not work that day, and specially called Hethaway Cress halfling Flodo and Drow elves Ayton and Karina to wait together.

Originally, he wanted to call Boulder and Johnson, but they were not interested in these eggs at all, and the two went to the training ground to fight. As time passed, soon there was a clicking sound in the room, which sounded like the sound of ice breaking, and a crack appeared in one of the pterosaur eggs.

The clicking sound kept ringing, and the cracks on the eggshell were increasing.