Shen Mu decided to use the three D-rank side plots and 6,000 reward points in his hand to strengthen his scientific and technological martial arts.

The exchange in the main god space is divided into several levels, and the levels are extremely strict, there is no corresponding level of side plots, no matter how many reward points you have, you can't redeem them, so although Shen Mu has three D-level side plots in his hands, he can only exchange D-level abilities, and if he wants to exchange C-level and B-level across levels, it is whimsical.

After repeated comparisons and studies, Shen Mu temporarily drew up a few scientific and technological martial arts that he wanted to exchange.

Steel Skin, Rock Skin, Wind Roar Fist, Thunderbolt Body, Military Fist ...... Wait a minute.

Among them, the steel skin and the rock skin are both scientific and technological martial arts that Shen Mu is more interested in, simulating the hard qigong of the outer doors of ancient martial arts.

Steel skin, as the name suggests, is a special liquid metal that will not be rejected by human cells into the deep layer of the skin through nano-level surgery, and then perfectly blends with the human skin. As soon as it is time to use it, this special liquid metal coalesces on the surface of the skin to form a strong protective layer to protect itself.

The rock skin seems to be similar from the name, but the principle is completely different, it is to strengthen the skin strength by injecting a drug deep into the skin, after several courses of repeated injections, the human skin will become tough and strong, and the appearance will not look much different, but it can resist strong impact and external force, and even because its own skin has gradually lost consciousness because of the injection of the drug, it can also effectively reduce the pain of the human body. It's like a rock-like full-coverage armor draped over the body.

Wind Roar Fist, the name of this high-tech martial art is very simple, it can even be said to be a little vulgar, but it is very powerful, it is a special metal limb that replaces its own arm bones...... Because the metal arm of this trait is equipped with a clever built-in air compression device, it can swing its fist with the same power as an air cannon. According to the introduction of the main god space, the Wind Roar Fist can be strengthened to the highest level of C-level, and after upgrading the air compression device in the metal skeleton, with ion energy as the driving energy, a high-strength compressed air cannon can accurately hit a target 40 meters away, with a power equivalent to a ton of fist power!

The body of thunder and lightning, which is also a kind of scientific and technological martial arts obtained through mechanical transformation of the body, is also the basis of all thunder and lightning scientific and technological martial arts, which is equivalent to the general outline of martial arts in the ancient martial arts of the inner family...... Some of the same nano-scale equipment is put into the various acupuncture points of the human body through precise surgery, and the lightning is released from the inside of the body through these devices, and the intensity of the lightning can be freely controlled.

Jundao Boxing ...... This is Shen Mu's favorite D-level side plot is enough to redeem the science and technology martial arts, the principle of science and technology is similar to the wind roaring fist, but it is to replace the joints in the body with some special metal equipment, when fighting, through these hard metal equipment to form a driving force inside the body, in order to strengthen or even replace the force of their own muscles, in an instant to form an extremely terrible explosive force, and Jundao boxing is also a very systematic type of science and technology martial arts, in which through repeated operations, the joints and bones in the body can be used, and even the internal organs are replaced with high-tech equipment.

For example, when the wrist is replaced with a spiral device, when the fist is waved, the wrist rotates at a high speed of 100 revolutions per second, and the propulsion system replaced by the joints of the elbows, arms and other body forces enhances the strength, and makes a terrible penetration of the 'spiral fist', it is said that when the bones in the body and arms are replaced, and then assisted by some kind of skin-strengthening transformation, one punch is enough to penetrate a tank, and the power is even more terrible than the power of anti-tank missiles!

Spiral fist strength, in fact, also exists in ancient martial arts, but the structure of the human body itself has certain limitations.

If you are a top master of cultivating external skills, you can also temporarily twist the muscles and skin of your wrist to play a spiral force, but it will definitely cause invisible dark injuries to your muscle fibers, and the number of twists of muscle fibers will also be limited.

From a certain point of view, in fact, science and technology martial arts is based on the ancient martial arts of the inner family, trying to break the limitations of the human body structure itself, with the assistance of scientific and technological means, breaking through the limits of the human body, and cultivating the incredible actual combat martial arts in the eyes of ordinary people.

It's just that the transformation of science and technology martial arts is also deviant and incomprehensible in the eyes of some people, so the difference between the ancient martial arts and the science and technology martial arts can only be said to be the opinion of the benevolent, and the wise see the wise.

However, Shen Mu still appreciates this kind of scientific and technological martial arts from a simple and actual combat point of view, at least it is not like the ancient martial arts of the inner family, which requires several years of diligent cultivation every day, and what ability is needed to directly transform the body accordingly.

Time-saving, easy, and absolutely practical!

This is an irreplaceable advantage for the reincarnators who are struggling in the main god space, and for the reincarnators who only have ten days of rest, they often have to practice diligently for ten years, or even decades, and the advanced exercises are really like a mirage, looking beautiful, but they can't touch the entity.

Maybe in the future, when Shen Mu can get the B-order, or even the A-level side plot, he will try to exchange for some god-level martial arts to experience the feeling of being a 'martial arts master'. But now, Shen Mu was unwilling, and he didn't dare to take out the side plots in his hands to exchange them for martial arts methods such as 'Golden Bell Jar', 'Iron Cloth Shirt', and 'Tiyun Zong'.

After all, it is better to practice the Golden Bell Jar than to coat a layer of steel mecha on the body like Roma.

And the cultivation ladder is not as good as wearing a Batman's 'hook crossbow' or Spider-Man's 'spider silk launcher', anyway, the effect is almost the same, but the price is worlds apart.

This is the most fundamental opposition between scientific and technological martial arts and ancient martial arts.

From the point of view of scientific and technological martial arts, instead of wasting a hundred years of time to cultivate a god-level technique that is enough to fly in mid-air, it is better to buy a supersonic fighter...... The latter can not only fly, but also fly at supersonic speeds!

After some research and comparison, Shen Mu then calculated the side plots and reward points he had, and finally determined which three technological martial arts to redeem.

It's just that after exchanging these three technological martial arts, the reward points you have will also be exhausted, and only a few dozen reward points will be saved in your hands, so that the 1000 reward points originally promised to Rom will not be able to be fulfilled, but I don't think Rom really cares about this.

And to be honest, this time the two of them accidentally got three D-rank side plots, if Shen Mu still handed over 1000 bonus points to Roma, there would eventually be a D-rank side plot left in his hands but could not be used, which is really a waste of team resources......

"Lord God, help me strengthen the three types of Military Dao Fist, Wind Roar Fist, and Rock Skin!"

A beam of light fell, and Shen Mu rose into the air.

This kind of enhancement of the main god space is completed directly in the pillar of light, instead of handing over the equipment to you for subsequent transformation, which is a great convenience, but it is tantamount to a torture for Shen Mu!

In the air, every material needed to transform the body is broken down into tiny units that are invisible to the naked eye, and then penetrates into the body through the pores of the skin, and directly undergoes a nano-level precision surgical transformation under the unpredictable means of the main god space!

However, the transformation of technological martial arts is generally on the operating table, and the target of the transformation will also be injected with anesthetic, and then carried out in a coma...... was forcibly transformed by hanging in mid-air like this, and it is estimated that Shen Mu is still the first.

Inch by inch of bone under the skin is dissolved and extracted, and then a trace of hard metal is smelted and molded in the body, which instantly replaces the original human bone...... If you look at the efficiency and results of the operation, the medical skills of the main god space are undoubtedly god-level existences, but for Shen Mu, it is a hellish experience!

The first transformation of the main god space is the replacement of the joints and bones required by the Jundao Fist, then the replacement of the two arm bones necessary for the Wind Roar Fist, and finally the transformation of the rock skin......

In Shen Muqiang's self-suppressed, but still terrible screams, the 'operation' of the main god space lasted for a full three minutes...... In these three minutes, Shen Mu experienced a torture called skinning and bone removal.

Although the process was cruel, the result was perfect, when Shen Mu was covered in stinky sweat and fell from the pillar of light, the terrible pain before had disappeared, and only the muscles that twitched non-stop still had the terrible memories of the past.

After Shen Mu's feet touched the ground, he collapsed directly to the ground weakly, gasping for breath, and it wasn't until a minute later that his eyes gradually regained their vitality, but the physical strength consumed during the operation did not recover so quickly.

Standing from the ground, Shen Mu immediately felt the different experiences brought by strengthening the scientific and technological martial arts.

The strange feeling of 'being reborn' made him feel a strangeness to his body that he had never seen before.

Metal joints, metal arm bones, it takes a while for anyone to get used to it.

Shen Mu stood still, his eyes were solemn, and he raised his arms exactly the same as before, but the weight had increased significantly. Shen Mu knew in his heart that this was because the bones had been replaced with metal structures, after all, metal was always heavier than human bones.

"Wind Roar!"

Shen Mu was angry, stood still, and threw a punch violently.

With the appearance of Shen Mu's thoughts, the air compression device in the transformed metal skeleton directly began to absorb the nearby air, and then as Shen Mu punched out, the absorbed air condensed into a ball, and then turned into a shock wave wrapped around the fist and swung out.

A giant dragon seemed to appear in the invisible air, and the dragon let out a low roar, rushed out in an instant, rolled up a shock wave, and then exploded more than ten meters away, making a bomb-like roar. An indispensable ripple swept in the distance, then dissipated into the invisible.

Speaking of trouble, in fact, it all happened in a second!

"Good...... Strong ......" Shen Mu looked happy and looked at his fists with incredible eyes.

"With the degree of transformation I am now and the air compression device in the arm bones, the air cannon can only be hit more than ten meters away at most, but the impact force released after this compression is at least hundreds of kilograms...... This is still after flying more than ten meters away, if it is a close-range hit, the explosive power is definitely even more terrifying! ”

Shen Mu muttered to himself.