Song Le's custom walk-behind tractor has undergone magic modification from the inside out.

The simplest and most basic magic change is the magic change of the engine.

Antonov's Goz is nothing more than a 600-horsepower diesel engine for heavy-duty trucks.

Song Le's one is simply a 3,000-horsepower marine diesel engine, and it is a specially customized miniaturized product, and the shape is almost the same as that of an ordinary diesel engine.

Some people may ask, the miniaturization of high-horsepower diesel engines itself is an industrial project with extremely high scientific research difficulty, not to mention whether there is such a technology, even if there is such a project, how can it be produced in a week?

If it's in the Overworld, it's naturally not feasible.

But this is a reincarnation space, and the rules are different from those of the overworld, so the impossible is possible.

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One of the laws of reincarnation: the reincarnation world is relatively isolated from the reincarnation space, the reincarnation space is relatively isolated from the main world, and the reincarnation world is absolutely isolated from the main world.

In addition to the rewards received by the reincarnated, items and skills in the reincarnation world cannot be brought into the reincarnation space.

Conversely, items and skills from the reincarnation space can be brought into the reincarnation world, but items and skills that exceed the current reincarnation world power ceiling cannot be used.

In addition to cash, items from the Overworld cannot be brought directly into the reincarnation space, but can be brought into the reincarnation space indirectly through exchange.

Conversely, the items and skills in the reincarnation space can also be indirectly brought into the Overworld, and they must not exceed the power ceiling of the Overworld.

The upper limit of the Overworld's power ceiling is the highest level in a certain aspect.

Take the engine, for example.

In terms of the miniaturization of high-horsepower engines, after a long period of scientific and technological progress, the main world has initially possessed relevant technical reserves, but the difference is only a large number of experiments and industrial production.

In this way, Song Le can get a miniaturized 3,000-horsepower marine diesel engine in the reincarnation space in the form of exchange.

From another point of view, there are many super technologies in the reincarnation world, such as the "Ark Reactor" on Iron Man's chest in the Marvel Universe.

In this regard, with the scientific and technological level of the main world, even a sustainable nuclear fusion reactor cannot be achieved, and it is far from reaching the scientific and technological level represented by the "Ark Reactor".

In this case, although the reincarnator can bring the "Ark Reactor" back to the Overworld in the form of exchange, due to the existence of the power ceiling in the Overworld, the "Ark Reactor" will be neutralized in the Overworld and will be completely unusable.

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These things don't mean much to ordinary reincarnators, they don't have that mind, and they don't have the qualifications to think about it.

But for the country, it is a very terrible change.

Before the reincarnation space, the Overworld human climbing technology needed to evolve step by step.

For example, the atomic bomb was first researched by Einstein's mass-energy equation, then by Hahn, Strassmann, Bohr, Wheeler, Chadwick, Oppenheimer and other world-class scientists, and finally the world's first atomic bomb was created by the Manhattan Project.

After the advent of the reincarnation space, the way humans in the Overworld climbed technology has changed dramatically.

Now, instead of scientists spending a long, long time studying those very, very esoteric basic sciences, reincarnators can go to a specific reincarnation world with relevant technology, and obtain the corresponding technology by doing tasks and so on.

After that, the Overworld will have the relevant technology, and then the ceiling of the Overworld's power in this area will be raised, and there will be no longer restrictions on the input of related technologies.

This is true for electromagnetic weapons, the same is true for the miniaturization of high-horsepower engines, the same is true for Barrett's automatic aiming function, and the same is true for rotorcraft unmanned attack aircraft with large bomb load and long endurance......

This is the premise of the advent of the era of global reincarnation.

Then, a terrible crisis also came with the emergence of these super technologies.

When one of the more than 200 countries in the Overworld is about to master super technology far beyond the others, and the other countries have no way to counteract, war will immediately begin.

Why?

The reasons are simple and complex.

From a small point of view, you don't know if your neighbor will retaliate against you because you bullied him back then, so you must defeat him before he develops to eliminate this possibility.

In the big picture, it would have to be explained by borrowing the Dark Forest Theory, the Big Bang Theory, and the Chain of Suspicion Theory, and things would be very complicated and difficult to explain.

When this happens, there is only one viable way for humans in the Overworld to cope, and that is to compete and balance each other.

In the form of a country, or a coalition of states, send reincarnators through a specific reincarnation world to obtain super technology, abilities, magic, superpowers, etc., that do not exist in the main world for the time being.

You have electromagnetic weapons, I have super AI, he has high-tech drones......

Humanity, just before the nuclear deterrent was about to fail, managed to find a new way of mutual deterrence, continuing to maintain a fragile state of peace until the balance of power spiraled out of control and the Overworld was truly destroyed.

But there is a problem here, that is, those who have the possibility of obtaining new technology may not necessarily be strong reincarnators, and other forces are very unfriendly to them, and they must be protected by strong reincarnators when they appear in a specific reincarnation world.

As a result, the arms race between the major powers and alliances in the main world has changed from a competition for who has more atomic bombs and missiles to a competition for who has more strong people.

And the strong here usually refers to the reincarnation above the pioneer level, especially the Chosen One.

Take the big hit 7 years ago - Marvel World as an example.

Before the advent of SCP - Land of Origin, in order to ensure the safety of the reincarnators who came here to do the mission, the Five Eyes Alliance invested 50 middle and high-level Chosen ones in the Marvel world.

Huaxia has invested 36 high-level Chosen Ones in this world, so that they can maintain an equal level of strength with the Five Eyes Alliance, deter each other, and ensure that the Five Eyes Alliance will not use their brains that should not be used.

By last year, after the appearance of "Cthulhu - Glorious Battlefield", almost all the countries and forces in the entire overworld voted for their chosen ones.

No nation would dare to retain its strength, for no one knows if any nation will gain the upper hand in the Glorious Battlefield and summon those old rulers to the Overworld.

It's not impossible for this to happen, and the incident of 7 years ago is still fresh in the memory of all the Chosen One.