Fang Zheng himself didn't know much about the history of this continent, so he didn't expect to be able to get such a secret from Wells.

According to the old paladin, the development of this continent in the hundreds of years before that was quite in line with Fang Zheng's imagination of the "Western fantasy of the Middle Ages". But it was from the Kadra Empire that the civilization development level of the entire continent took a big leap. For example, the magic warships and even magic engines used now actually had their prototypes during the Kadra Empire period, but the Kadra Empire itself did not develop them at that time - or think about it, it was precisely because the development of these things required a lot of resources and manpower that the Kadra Empire chose to invade other countries.

The Holy Kingdom did not say much about the Kadra Empire's statement at the time. They did not become furious as Fang Zheng had imagined and then call on the coalition forces to execute the country on the spot in the name of "blasphemy".

After all, the core doctrine of the Holy Kingdom is to maintain order. What's more, there are really gods in this world. If you, Kadra, keep jumping like this, you will be doomed sooner or later without the blessing of gods... Well, it was proved later that the idea of ​​the Holy Kingdom was indeed correct. Kadra kept jumping and then was attacked by the army of devils.

After hundreds of years of war, the Kadra Empire was destroyed. Although the coalition forces of the Holy Kingdom and the Magic Kingdom repelled the devil's army, the order of Kadra had collapsed and was invaded by chaos. This also led to these countries only being able to find a few scraps from the ruins of Kadra to study, and then retreating in a hurry... If you don't run away now, you won't be able to escape.

The magic engine was developed by these countries based on the wreckage picked up by Kadra. Judging from the results, this empire has really contributed to improving the overall level of the continent.

Since Kadra is dead, then the empire's claim that "they received the goddess's gift" is obviously nonsense, but if you think about it carefully, it is not impossible. If the Kadra Empire has unearthed equipment, weapons depots or research centers used by a goddess, just like a country in World War I dug up a UFO, wouldn't it also improve its strength?

And because Kadra is so confident, she claims that she was blessed by the goddess, and there seems to be nothing wrong with that?

Of course, these are just guesses. We will know the truth after we enter the underground ruins.

After two days, the coalition forces finally advanced to the entrance of the underground space. This time, Knight Commander Wales seemed to have given up. He no longer asked Fang Zheng to take him down with him. However, Knight Commander Wales sent Fang Zheng a person who was beyond his expectations.

"Ms. Fina?"

"It's been a long time, Mr. Fang Zheng."

The girl holding a scepter and wearing a priest's uniform greeted Fang Zheng with a sweet smile. Fang Zheng was quite surprised to see Fina.

"You are also participating in this coalition? Why didn't I see you?"

"I was just sent here because Knight Commander Wells said he needed my help, so I came here..."

“I see…”

Hearing Fina's answer, Fang Zheng nodded. He didn't know why Wells chose to send Fina. But thinking about it carefully, maybe it was because she had a closer relationship with him? If that was the case, it made sense. After all, the Temple was not unaware of the relationship between him and Fina. If they wanted to get closer to each other, it was normal to send Fina.

"Are we going down into this cave next?"

As she spoke, Fina glanced at the huge cave in front of them. The cave was hundreds of meters wide and almost bottomless. According to the records obtained by Neptune through the probe, the cave was at least about 1,500 meters deep from the underground space.

If this was really discovered by the Kadra Empire, Fang Zheng was really curious about how that country dug such a deep hole.

"Then let us go."

Since Fina was already here, Fang Zheng certainly wouldn't send her back. Previously in the Dark Swamp, this priest had shown her familiarity with the history of the continent, so perhaps there was still a chance to use her knowledge here. And compared to other people, Fang Zheng trusted Fina more.

Although Neptune has confirmed that there is no danger inside, for the sake of safety, Fang Zheng did not bring too many people with him this time. In addition to himself, the first person Fang Zheng wanted to bring was the little angel. If the goddess's relics really came from a higher civilization as Fang Zheng guessed, then Nymph, who could crack all intrusions, was obviously the best choice.

The next one was Fina, and besides Fina there was also the Javelin. After all, it was impossible for Fang Zheng to just use the Feather Falling Technique to float down into such a deep cave, so he chose to ride the Javelin's Hidden Bomb, and...

"Iona...are you sure you want to come with me?"

Looking at the girl beside Javelin, Fang Zheng couldn't help but ask, and Iona nodded.

"Of course, since Fang Zheng is my captain, and as Fang Zheng's mental model, I naturally have to act together with Fang Zheng."

Hey... this girl is in a bad mood.

Looking at Iona in front of him, Fang Zheng was speechless. Now Iona has been upgraded from a stealth bomber to a battleship. Due to its huge size, Fang Zheng has delegated many tasks to other battleships, which makes Iona somewhat unhappy. Originally, Fang Zheng did not plan to ask Iona to accompany him this time, but after she knew Fang Zheng's decision, she pestered him to come along... Fang Zheng agreed after just a little hesitation.

After all, he is our own child.

And just like Iona said, she is Fang Zheng's flagship, but Fang Zheng leaves everything to other people. Well... although it is true that everyone has their own responsibilities, but... for Iona, there are still some complaints.

"All right."

In the end, Fang Zheng still chose to take Iona with him. There was no special restriction between the mental model and their warships. If possible, Iona could travel around. But generally speaking, just as humans would not choose to leave their homes too far, mental models rarely leave their warships.

After confirming the number of people, everyone boarded the Javelin stealth bomber and then quickly headed into the cave.

"What a unique design..."

Sitting in the cab, looking at the decorations full of futuristic sci-fi flavor and the flashing panels in front of her, Fina couldn't help but sigh.

"This is completely different from our technology..."

"Oh? Really?"

Hearing Fina mumbling to herself, Fang Zheng turned around and glanced at her.

"But if you want, you should be able to do this."

"That's true."

Faced with Fang Zheng's answer, Fina couldn't help but smile awkwardly.

"In fact, the Temple has already started discussing whether to use metal to build magic warships...Mr. Fang Zheng, you have surprised many people."

“I see.”

Fang Zheng was not surprised by the Temple's reaction. In fact, the Magic Kingdom had already entrusted Miss Ogran to pass on a message to him, hoping to study these metal warships. They were even willing to exchange their treasured magic for this. Fang Zheng was also somewhat tempted by this, but unfortunately, when he asked about the mental models, he was unanimously rejected by everyone.

Even the vampire who usually behaves very openly said, "I only sell my art, not my body. Wanting to see my engine is too perverted! H! Obscene! Perverted! Shameless!"

So Fang Zheng decisively swallowed back the dangerous topic of where the engine belongs to in the mental model.

But then again... this doesn't seem like the technology that a country in a fantasy magical world would possess.

Looking at the hole in front of him, Fang Zheng's expression became more serious. It was not because he found anything unusual, but because the hole itself was very unusual. He had not discovered it before, but after the javelin entered the passage, Fang Zheng found that the hole was dug at a perfect 45-degree angle, and the walls around it were unusually smooth. It did not look like a man-made cave at all, but rather like a hole that was penetrated by some kind of ray.

If it were Fang Zheng, this level of penetration could only be achieved by the main guns of battleships such as the Hell's Angels and Paladins. But here, is there such power?

While Fang Zheng was thinking, the javelin had already passed through the passage. Then, under the illumination of the light, the originally dark underground world revealed its true face in front of Fang Zheng.