The reason why such a thing did not happen was that the time travelers appeared for a short time and the natives were not familiar with them. The time travelers were domineering and unscrupulous, catching the natives off guard.

Give the natives a few years to figure out the time traveler's background. It's hard to say whether the time traveler will still be as comfortable as he is now.

Only by constantly improving yourself, developing technology, and making yourself stronger can you truly survive.

People who are too arrogant die quickly and miserably. This is what happens in movies.

The strength of the time travelers themselves is actually not strong at all. They are still just ordinary people, and the only thing they can rely on is the mobile city.

When you have time, you should study more.

Li Ziyu reopened his technology tree and prepared to continue lighting up the technology.

After his last research, his mechanical technology has unlocked the Sky-Splitting-level fighter jets. He sold a batch of fighter jets to Iron Heart, and the cost has long been recovered. He now has enough resources to continue researching new technologies.

Among the Sky-Splitting-level troops, there is an absolutely core troop called the Sky-Splitting Fortress!

[Sky Fortress]

【Category: Mechanical Engineering】

[Type: Strategic Sky-Splitting Class]

[Introduction: A strategic core unit of the Mechanical Skeleton Undead. This special construction unit can be continuously upgraded with new technologies. It serves as an ammunition depot, equipment warehouse, and troop station, as well as an aerial fire support, aerial turret, and aircraft platform... As long as you invest enough resources and technology, the Sky Rift Fortress will give you endless surprises.]

[Requirements: Soul Energy*unit, Skeleton*unit, Soul Core*1000, Steam Core*1, Rayquaza*1, Super Spiritual Wisdom Core*1...]

Not to mention anything else, just looking at the long list of resources needed for the basic version of the Sky-Splitting Fortress made Li Ziyu's heart twitch.

This is definitely a big thing, on the same level as the Skeleton-class Evil Ark.

The positioning of the Sky Fortress and the Evil Ark is different. The Evil Ark is positioned as an aerial mothership, while the Sky Fortress is positioned as an aerial fortress.

If the two were combined together, Li Ziyu couldn't imagine what kind of terrifying combat power would be displayed.

Moreover, this Sky-Splitting Fortress is only a basic version, and new things can be added to it continuously, making it more and more powerful.

Imagine the battlefield of the future, with Iron Skeletons below, Sky-Rift Fortress and Evil Ark above, plus a large number of fighter planes of various levels, and comprehensive ground and air strikes. Oh wow, so cool.

Enemies will experience a fiery reception from the Skeleton Undead, and when the firepower pours down, a funeral will be held with grand fireworks!

The Ghost Ark is already very good, it can even contain the fortress. I wonder what surprises the Sky Fortress can give him.

The basic version of the Sky-Splitting Fortress is mainly composed of two parts. One part is the Sky-Splitting Base, which is a cube that is more than 400 meters long and more than 50 meters high.

The other part is the super-spiritual wisdom core, a huge sphere made of metal and bones, with various tubes and hollows on it. Inside, you can see a blue soul flame ball burning like the sun.

The core of the super-spiritual wisdom is a transformed undead, which gathers a large amount of soul energy and forms a new form. It has self-awareness and is extremely intelligent. It can control the entire Sky Fortress.

The materials for the Sky-Splitting Fortress are all separate. You need to make the Sky-Splitting Base and the Super-Spiritual Wisdom Core separately, and then assemble them.

Li Ziyu never thought that it would take so short a time to build such a high-end gadget.