After driving the old apprentice to cultivate, Bai Yuqi rubbed his hands like a green-headed fly, salivating at the soul energy and faith he had absorbed.

Coupled with what he originally left, he now has a total of 41191 faith and 127641 soul energy, and he can upgrade again!

The spell power is enough to help him build the Kugu Pass quickly, but it is his mana that limits the construction speed.

The mana value of 9490/9490 points seems to have increased nearly a hundred times compared to before, but the increase in the power of the spell and the mana consumption have also increased by hundreds or thousands of times, so Bai Yuqi simply put all the soul energy into it:

Soul energy 127641-3400, promoted to [0 level 9], 9490 + 180×34 = 15610, gain a number of skill points;

Soul energy 124241-5500, promoted to [0 level 10], 15610 + 180×55 = 25510, gain a number of skill points;

Soul energy 118741-8900, promoted to [0 level 11], 25510 + 180×89 = 41530, obtain a number of skill points;

Soul energy 109841-14400, promoted to [0 level 12], 41530 + 180 × 144 = 67450, gain 1 attribute point, gain a number of skill points;

Soul energy 95441-23300, promoted to [0 level 13], 67450 + 190×233 = 111720, obtain a number of skill points;

Soul energy 72141-37700, promoted to [0 level 14], 111720 + 190× 377 = 183350, gain a number of skill points;

[Intelligence] 18+1=19, base mana 190, each [Meditation] increases the upper limit of mana by 1.9% (3483.65), and the balance is 34210 soul energy;

......

Looking at more than 180,000 mana points, Bai Yuqi hung up the [Spell Upgrade] and [Spell Strength] specialty effects, and began to move bricks in high spirits!

As the shaking of the sky and the earth cracked in the bitter valley pass, the mountain beams were also shaped into towering dormitory buildings.

In the night, there seemed to be an invisible giant spreading joy in the empty valley, anyway, the Yang villagers of the entire Kushui Village didn't want to sleep tonight.

In addition to the vibrations that lifted people from the bed, a large number of cows, horses, donkeys and mules also wailed with their voices.

What else can the villagers do except huddle on the bed with their pillows and shiver, and contribute their faith to the great lord who is showing his powers?

When the sun first rose, the vibrations in the col gradually disappeared, and the villagers, who had barely slept all night, walked out of their ethereal houses trembling with thick dark circles under their eyes, but they were stunned by the changes in the bitter valley pass!

The mountain beams that used to surround Kugu Pass like two arms disappeared and turned into two long, steep "walls".

It's just that the "city wall" is layered up, separating many rooms, and even the originally open valley mouth is closed by the "city wall", forming a "valley city".

The eldest lord and the old sun immortal who had been making a fuss all night were nowhere to be seen, and they didn't know that they were still using their magical powers in that corner, and after the villagers looked at each other for a while, what should they do...... Well, they're all used to it!

When Yang Tieniu and the others yawned and came to the bitter spring salt field on the hill behind the village, they found that earth-shaking changes had also taken place here.

It is also a city wall that encloses the hill where the bitter spring salt works are located.

The original cluttered woods were removed, and layers of shallow "terraces" appeared on the hills, covering almost the entire area enclosed by the city walls.

The underground salt brine, which is significantly larger than before, flows along the canal that extends from the bitter spring pond to each layer of the "salt pan".

Obviously, Bai Yuqi was not satisfied with the original method of cutting wood and charcoal to cook salt, and the temperature rose in the summer, so he planned to try the way of drying salt.

But it is obvious that drying salt is much slower than boiling salt, squatting by the salt pond and staring for a long time, and did not find that the salt brine has become shallow, Bai Yuqi began to be impatient.

Looking up at the newly rising sun and the shadow cast by the city wall, Bai Yuqi realized that he had done something stupid, patronizing the salt works to protect them, but forgetting that the city wall would block the sun.

Bai Yuqi, who patted his head, swore that this was definitely not his stupidity, but a momentary negligence!

Hmph~ Can't you dry salt if the sunlight is blocked by the city wall? Bai Yuqi won't admit his mistake!

[Fossil is sand] + [Sand into glass] + [shaping], Bai Yuqi made a glass plate the size of a basin.

After looking at it over and over again, he suddenly looked up and asked Yang Tieniu, who was curiously coming over to see what he was doing: "Is there any silver in the village?"

Yang Tieniu was stunned for a moment, nodded and said, "Yes, I went to Chang'an yesterday to sell salt and collected a lot of silver collars......

"Go get it!"

After Bai Yuqi gave an order, he ran to the city wall with the glass plate in his hand.

Yang Tieniu had no choice but to ask Yang Xiaoshan to quickly run back to the warehouse behind the villa and bring the silver collars that were brought back as salt.

Then he also followed Bai Yuqi to the city wall, the original carbon kiln was destroyed by Bai Yuqi, even if they wanted to work, they couldn't do it, so they could only follow the old man closely to see what he had to say, so as to help run errands.

Yang Xiaoshan's legs and feet were fast, and he soon carried a sack of silver collars one foot long and two inches wide.

Although silver was also a precious metal in the Tang Dynasty and could be traded as a commodity, it was limited to some bulk goods and the use of the upper class of society.

Because the value of the salt coins brought by Yang Tieniu and them this time was too high, the big households in Chang'an wanted to exchange a little more, so they brought back a lot of gold and silver to exchange for salt coins.

Bai Yuqi took out a silver collar and looked at it, it was gray and not as bright as the silver of later generations.

There are also a lot of words engraved on it, in addition to the origin of silver, craftsmen and the like, there are also the words "fifty taels".

It felt quite heavy in his hand, Bai Yuqi checked it and estimated that it weighed two kilograms, and regardless of the fact that this collar of silver might be worth sixty or seventy yuan, it was directly melted and turned into a ball of silver liquid.

The spell given by the system is so magical, it is obviously not hot at all, but the silver liquid remains in a liquid state, and it is only transformed in terms of form and nature.

After being purified as much as possible by Bai Yuqi with [Refining Technique] and [Extraction Technique], although the purity is not known for a few nines, it can be seen that at least it is much brighter.

After a thin layer of silver water is applied to the back of the glass plate, it immediately becomes a silver-plated mirror, which is bright enough to illuminate the person.

Ignoring Yang Tieniu who was exclaiming and admiring behind him, Bai Yuqi jumped on the fence of the city wall with a mirror and shone down, refracting the sunlight into the fenced salt field, adjusted the angle and nodded with satisfaction, and began to manufacture in large quantities.

In order to make the mirror wall large enough, the glass plate had to be made very thick, and it had to be framed with [stone plastic].

After a long day's work, a group of people finally filled the west wall of the bitter spring salt field with a row of inclined silver mirrors, refracting the rising sunlight into the high wall and projecting it on the salt pond.

But Bai Yuqi looked left and left, and couldn't help frowning and pondering again.

He felt that this still didn't seem to have much effect, except that the sun could shine earlier and the salt field was a little brighter.

A dignified immortal wants to make a move with this effect, and he "Wuji Immortal Venerable" doesn't want to lose face?

With a wave of his hand, Yang Tieniu led the villagers to dismantle the mirrors again, and then with a big move, the west wall of the salt field began to rise, thicken, and dent, turning into a cauldron inserted into the ground.

Then he led the villagers to start making curved mirrors one by one, and inlaid them piece by piece into the sunken cauldron on the east wall to make a super huge "mirror pot"!