"Woo chirp!"

Xiao Kong screamed sweetly, needless to say, he must have to take Feiya to the swimming pool to swim.

The preheating channel was still the same at night, and Luo Yu and his team passed the level without encountering any resistance.

In the room where the golden egg was smashing, Fang Yumeng chuckled and said, "Hey, you're the best luck, it's better for you to come."

Luo Yu took the initiative and smashed the hammer in everyone's expectant eyes.

"Bang!"

The golden egg cracked and a scroll appeared.

[Squad Sharing Technology Scroll: Thermal Energy Air Defense Technology]

"Huh!"

Fang Yumeng said in surprise: "This is the technology of the air defense tower!"

Alina looked at the scroll, then looked at Luo Yu, and sighed: "You two human races... are both lucky."

Everyone's eyes showed joy, and Luo Yu was overjoyed!

He had long wanted to build an air defense tower, but there was no scroll. Unexpectedly, this time the Golden Egg actually released a scroll!

Luo Yu smiled and said, "We won't sell this scroll, I'll use it now."

"Um!"

No one has any objection. Although it will be auctioned soon, this kind of precious shared technology will definitely not be sold.

Click to use, and everyone has received a prompt to unlock technology.

Everyone went back to their homes, Luo Yu was soaked in the bathhouse, gently pinched Xiao Jin's tiger tail beside him, and smiled and said, "Go and get me a glass of juice."

"oh!"

Xiao Jin was about to get up when he suddenly remembered something and said, "Master, can you drink the wine you brewed?"

“I want to taste it.”

Luo Yu said with a funny look: "I almost forgot if you don't say it, and I'll take out the wine tomorrow."

"Go and get me juice."

Xiao Jin nodded with a smile, and Luo Yu was now studying the technology that he had just unlocked.

There are many buildings for this thermal air defense technology tree. The cheaper ones include thermal javelin launching towers, thermal air-to-air arrow launching towers, and advanced ones include thermal light column air-to-air bombardment cannons, etc.

The functions of javelins and arrows are similar to those of arrow towers, so there is no need.

Light column bombardment cannons are too expensive, even more expensive than electric shock towers.

After studying for a while, Luo Yu finally decided to build the [thermal energy condensation bomb air defense tower]

This thermal air defense tower does not need to consume wood as raw materials, but instead uses thermal energy to condense into fist-sized thermal bombs to bombard the sky.

The attack power is 10 points, which means that it can kill creatures below 10 points in seconds. It is not very powerful, but its firing rate is good.

Launched once in 1 second, with an air range of 2 kilometers.

The range of 2 kilometers basically exceeds the limit of airship rising. The most important thing is that the cost is cheap.

[Thermal energy condensation bomb air defense tower: flint brick*500, iron ore*500, copper ore*500, silver*5000]

Not to mention the cost of this construction, it is very cheap even compared to the arrow tower.

Of course, cheapness naturally has many disadvantages, such as 10 heat energy is consumed for each launch, which consumes a lot of energy.

It can only face the sky, not the earth.

In addition, this belongs to architecture rather than furniture and cannot be critically attacked.

If Luo Yu hadn't had obtained 10 thermal energy collection boards before, he might not have been willing to build this thing.

"Let's build it tomorrow!"

Luo Yu thought so in his heart, took a shower and went to bed.

After breakfast in the morning, Luo Yu walked to the east of the territory. The first thing he built was not an air defense tower, but a strike array.

After several strengthenings, the territory has expanded a lot. The original strike array can no longer fit the air wall, so it needs to be built again.

This is simple, narrowing the original entrance space, building a death corridor, and then two walls circle out the new entrance.

Luo Yu has long been familiar with this job.

Of course, this is not enough. The newly released death corridor needs to be filled with arrow towers on both sides.

Currently, there are 170,000 wood and 320,000 stone bricks in the territory, and it’s all done!

After a pause, the strike formation was perfect again, and because of the additional corridor and two arrow towers, the defense will only be stronger than before!

Luo Yu clicked on the construction page and began to build a condensation bomb air defense tower.

The enemies coming from the sky are not like land, and there is only one intersection. The entire air wall on the east is almost their attack range.

The horizontal defense direction of the east is about 7.5 kilometers, and the coverage radius of one air defense tower is 2 kilometers. In other words, two air defense towers can basically cover the airspace of the east.

The firepower of the two seats alone is definitely not enough, so Luo Yu decided to arrange the air defense tower in the form of architecture and ladders in sectional blocking.

At the extreme range position 2 kilometers away from the east air wall, a row of four air defense towers are arranged to ensure that once the opponent's air force enters the airspace, it will be immediately hit by fire.

If the opponent wants to destroy his air defense tower, he needs to advance to the range of the arrow.

It's like being beaten all the way in vain.

This is much better than building it directly next to the air wall.

The second-tier air defense tower can be directly built on the base wall. The base wall is about 3 kilometers away from the first-tier air defense tower. Once the opponent's air force approaches the base, the air defense tower on the base wall and the first-tier air defense tower can form a cross firepower, causing continuous strikes on the enemy air force.

This is the architecture air defense echelon conceived by Luo Yu.

In other words, building eight air defense towers at this stage, plus electric shock towers and so many arrow towers should be able to make the enemy's air force return in a defeat.

Moreover, the construction of the first-tier air defense towers is also beneficial in the field. If the opponent breaks through the strike formation, he will be attracted by the air defense tower during the impact and then demolished.

This can slow down some of the enemy's charge.

When five electric shock towers fire in 5 seconds, as long as they can hinder the opponent for half a minute, they can kill dozens of attacking units on the opponent.

When he thought about it, Luo Yu began to build an air defense tower according to his own vision.

On the grassland, a light flashed in front of him, and an air defense tower appeared in front of Luo Yu.

This air defense tower is only one meter high, stone-like, and looks like a small stone radar. The bowl-shaped center store is the place where heat energy condenses bombs are fired.

After a little time, Luo Yu built all eight air defense towers, and the next step was to connect the energy pipeline.

Copper mines are sufficient at present, so it's all done if they are built.

However, eight air defense towers consume 80 heat energy in one round of volleys, one shot in a second, and one shot in a minute.

In other words, even a fully-stocked thermal energy storage box can only last about 10 minutes.

In addition, the release of the arrow tower also requires heat energy to be consumed. A thermal energy storage box is definitely not enough, and another one needs to be built.

It is not just a thermal energy storage box, but it is best to build one more lightning energy storage station.
Chapter completed!