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It was around noon, the sun blazed overhead, scorching the earth, Lu Chen personally went to the military camp in the south of the city.

The soldiers in the camp were curious about what the Emperor was here for today, but to keep it secret, Lu Chen did not allow these soldiers to see him testing the rune weapon.

Lu Chen ordered all the soldiers in the southern camp to stay inside the camp, only allowing the Jinyiwei Guards to stay by his side.

In the dense jungle, Lu Chen released his spiritual power, sensed the entire forest to ensure no outsiders were around, then he raised the rune firearm in his hand, aiming at a steel plate five centimeters thick in the distance.

Initially, Lu Chen planned to start from one centimeter and gradually try higher, but considering that the previous test shot had directly penetrated so many armor pieces, he thought that shooting through one or two centimeters of steel plate might not be a big problem. He decided to directly go for full strength.

At this moment, the Jinyiwei Guards and Mo Xing were staring intensely at the rune firearm in Lu Chen's hands, curious to know whether this special rune weapon could penetrate a five-centimeter-thick steel plate.

Lu Chen did not immediately pull the trigger; he felt that the power of the rune weapon should be even more formidable than he had imagined.

He then turned his head to the Jinyiwei Guards and said, "Move back another hundred meters."

As soon as he spoke, Lu Chen used Shadow Shifting and took the lead in moving back a hundred meters. Seeing Lu Chen fall back, the Jinyiwei Guards hurriedly followed.

Finding the distance satisfactory, Lu Chen then channeled spiritual power into the firearm. The next moment, the explosive talisman pattern on the firearm emitted a blue glow.

Immediately after that, Lu Chen pulled the trigger; the moment he pulled, a huge recoil hit him.

Lu Chen was now a Pseudo Celestial, not just an ordinary one, but even someone of his realm could feel the recoil, which spoke volumes about the power of the firearm.

The next moment, the bullet flew out of the muzzle, beginning to absorb the faint spiritual energy around it. In an instant, the bullet collided with that five-centimeter-thick steel plate in the distance.

The moment the bullet collided with the steel plate, the explosive property of the talisman pattern activated, and the bullet burst explosively, sending off a burst of blue light.

The range of the blue light was not very large, but that five-centimeter-thick steel plate was instantly shattered into smithereens.

Seeing this scene, everyone present was stunned. That was a steel plate five centimeters thick, and it just shattered like that.

The power of this rune weapon was incredibly formidable!

After snapping back to reality, Lu Chen immediately said to the Jinyiwei Guards, "Add another steel plate, stack two of them."

Hearing Lu Chen's command, the Jinyiwei Guards, having recovered from their shock, quickly got to work and placed two more five-centimeter-thick steel plates in the distance.

After the soldiers returned, Lu Chen was about to pull the trigger when he noticed that cracks had appeared on the body of the gun.

This...

Lu Chen immediately understood what was happening—channeling spiritual power had exerted too much pressure on the gun's body, and the material used to make the gun wasn't strong enough.

To mass-produce the rune weapons, they would need stronger materials, but the steel they were currently using was already the strongest available.

Seeking other materials would probably have to wait until their technological level had advanced.

Seeing that Lu Chen had not pulled the trigger, Mo Xing's gaze turned towards him. At that moment, Lu Chen thought of something and then asked, "The firearms we initially made, because of the material issue, did we not thicken the gun bodies?"

When they started making firearms, the strength of the steel wasn't enough, so the craftsmen thickened the bodies and components of the guns, making each one nearly as heavy as a small mortar.

Later, as the strength of the steel material increased and the refined steel became more stable, the gun bodies were gradually made smaller.

Upon hearing Lu Chen's question, Mo Xing immediately replied, "Yes, Your Majesty."

After thinking for a moment, Lu Chen then said, "After we get back, let's make a batch of new firearms using the old method. Don't worry about the weight, as long as a Fifth Grade Martial Artist can carry it, it's fine."

Mo Xing immediately grasped Lu Chen's meaning, "Yes, Your Majesty."

Lu Chen then picked up another musket and carved the Explosive Talisman Pattern onto it. After loading the bullet and infusing it with Spiritual Power, he pulled the trigger at two overlapping steel plates in the distance.

Bang…

As the loud sound of the musket erupted, an explosion also occurred at the steel plates a moment later.

Boom…

The sound of the explosion was somewhat dull, unlike that of cannon shells.

After the blue light of the explosion, the front steel plate was shattered, and the one behind it was indented by the blast.

Lu Chen thought to himself that the power seemed limited; he had thought the second steel plate could have been penetrated as well.

Just as Lu Chen was thinking this, a system notification sounded.

"The power of the Explosive Talisman Pattern not only relates to the amount of Spiritual Power infused but also to the amount of gunpowder in the firearm, with the talisman pattern serving a supplementary role."

Hearing the system notification, Lu Chen was taken aback. It related to the amount of gunpowder?

Wouldn't that mean the power would be even greater if the Explosive Talisman Pattern were inscribed on a cannon?

With this thought, Lu Chen was eager to experiment.

However, considering there were still many unresolved issues within Great Sum, and that releasing such a powerful weapon could potentially impact himself, he decided to wait until after defeating Great Qian to add the Explosive Talisman Pattern to cannons.

At this moment, Lu Chen glanced down at the musket in his hand; just like the previous one, it had already developed a crack in the barrel after being correctly used once.

The material strength was not sufficient; it was indeed necessary to thicken the barrel. It seemed that in the future, only high-ranking Martial Artists could use Rune Weapons, as ordinary people would not be able to handle them.

Indeed, to unleash the true killing power of Rune Weapons, one needed to infuse them with Spiritual Power, and the least capable of externalizing True Qi were Half-step Grandmasters.

Rune Weapons really weren't something ordinary soldiers could use, so even if they were heavier, it didn't matter. Of course, the penetrating power of Rune Bullets was also impressive. Though ordinary soldiers couldn't fully unleash the power of Rune Weapons, the power of Rune Bullets and Rune Cannon Shells was still considerable.

Then, Lu Chen switched to another musket and said to the Jinyiwei Guard, "Replace the steel plate again."

Hearing this, the Jinyiwei Guard quickly changed the steel plate while Lu Chen took the opportunity to load another ordinary musket with Rune Bullets.

Once the soldiers had replaced the steel plate, Lu Chen immediately pulled the trigger, and with the sound of the gunshot, the distant steel plate burst into countless sparks.

This time, the bullet also penetrated the steel plate, but upon touching the steel plate, it immediately melted, leaving only a small hole.

Without infusing Spiritual Power, the effectiveness of Rune Weapons indeed greatly diminished; recall, he had only slightly infused some Spiritual Power earlier, and the steel plate was directly shattered.

Then, Lu Chen further tested the impact of the amount of Spiritual Power infused on the power of Rune Weapons. Through his testing, under conditions of sufficient Spiritual Power, a Rune Musket could completely shatter a ten-centimeter-thick steel plate, which was comparable to a modern armor-piercing bullet.

There was, however, one issue—that if he increased the infusion of Spiritual Power, the musket was very likely to explode. For safety, Lu Chen could not continue to increase the infusion of Spiritual Power.

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This also made Lu Chen realize how formidable the material used to make the Slayer Spear was. The Slayer Spear could not only fully withstand his infusion of Spiritual Power but could also crazily absorb Spiritual Power.

Lu Chen immediately decided to send people to Fengyin Island to look for the materials used initially to make the Piercing Cloud Bow and Piercing Cloud Arrow.

These materials from other worlds would presumably be suitable for making Rune Weapons.