"Hmm...... RPG...... AK ......" Zheng Yichen pinched his chin and looked at the two weapons in front of him, the principle of the firearm he had traveled through the past 100 years, plus the alchemy and engineering knowledge of this world, the difficulty of figuring it out was not high, as for memory or something, with the enhancement of spiritual power, he found that even though he could not recall everything he had seen in great detail, he could probably think of it.

This kind of thermal weapon was created by Zheng Yichen with materials, as for the use of magic weapons, the magic weapons made of magic are only limited to cold weapons, and there is no need to think about the slightly more complicated ones, not to mention the guns This kind of weapons with sophisticated internal structure, Zheng Yichen can only get out the real thing.

While Zheng Yichen was considering whether to add thermal weapons to the Demon Soldier Summoning Book, a ghost maid came over and curiously grabbed the RPG that Zheng Yichen had put aside......

"Hmm, let's test the performance first, really, this thing can't be summoned and projected......" Zheng Yichen muttered to himself with some confusion, the demon soldier can be easily loaded into the demon soldier summoning book, purely because of its structure composed entirely of magic power, this kind of physical weapon is not so convenient.

The magic power consumed when the magic soldier is summoned and used is a one-time thing, if it is a firearm, then it can be completely modified to pay additional magic power for the bullets that are fired! This is a good way to summon the magic power of the book circle for the magic soldier! Unfortunately, it can't be used like the magic soldier.

Zheng Yichen, who was thinking about how to make a breakthrough from this aspect, inadvertently brushed aside the little ghost maid who put the RPG trial version on his shoulder, and suddenly jumped up in fright, "Wait! Don't pull the trigger!!"

The ghost maid turned her head and glanced at Zheng Yichen with some confusion, she was able to make such an action, it was purely because she saw Zheng Yichen controlling the movements of the alchemy puppet, not to understand the use of PRG, let alone the danger of this thing, so when she turned her head, she stupidly pulled the trigger......

Boom –

The ghost maids who were cleaning the castle heard a loud noise, and couldn't help but put their eyes on the place where the explosion sounded, one of the walls of the castle was scorched black, and there were a few more cracks, and the ghost maid who knew that she was in trouble threw the RPG she was carrying at Zheng Yichen's feet and ran away without a trace.

“...... This wall is really strong. Looking at the almost non-destructive wall in a daze, Zheng Yichen said a little sluggishly, the RPG rocket is not a pure explosive structure, and Zheng Yichen doesn't know the formula, so he can only try to mix the otherworldly version of the explosive from the alchemy knowledge, although it is explosive, but it contains magic power, so the power is even stronger, although this is a trial version, but it is several times more powerful than the rocket in the world before the crossing.

But...... It's useless, at that time, Zheng Yichen thought that this wall was going to collapse, but it turned out to be dark, and a few more cracks were over?

"Can I say that this has nothing to do with me?" Looking at the ghost maids in front of him who came to Xingshi to ask for their crimes, Zheng Yichen pulled the RPG at his feet aside, blinked his bright dragon eye beads, and said very innocently.

The ghost maids didn't say anything, but threw a large rag in front of him that would wrap them all up, and provided a large bucket of water by the way......

"Okay, okay, I'll clean it up. Sighing, Zheng Yichen picked up the bucket of water to wipe the black marks on the wall, sorting out the things that were blown away because of the air waves, no matter what, the power Zheng Yichen had already seen that it was much more powerful than the fireball he rubbed out, and it was enough to drink a pot directly on himself.

This is still a trial version, the power of the full version can be further improved, and the wealth of knowledge in the underground library is too huge, Zheng Yichen has benefited a lot from digesting a part, just with the knowledge of alchemy plus his own knowledge of the other world, just the ammunition of the RPG Zheng Yichen can be extended into many versions.

In a world with magical existence, rockets can be fired not only with flame explosions, but also ice explosions and thunder explosions!

"Oh, thank you. Zheng Yichen, who was struggling to clean up the scorch marks on the wall, looked at the little head that poked out beside him, and washed it in the bucket she held up with a rag, seeing that he didn't investigate the meaning of what happened just now, the ghost little maid breathed a long sigh of relief, and showed a big bright smile in the face of Zheng Yichen.

Start City, because of the appearance of the magic soldier summoning book, the sales of magic weapons here have been greatly impacted, and even people from other cities have come to Start City, the purpose is to get a magic soldier contract, after selling several magic soldier summoning books at a high price in the black market, Zheng Yichen gave up this way of making profits, this kind of thing is enough to come a few times, and it is easy to burn himself if there are too many times.

Besides, these books originally brought him great benefits, which made Zheng Yichen regret that he had scattered those originals, was it too casual?

After leaving some gold coins responsible for expenses, all the remaining proceeds were exchanged for various materials by Zheng Yichen, as for the doorway, Zheng Yichen also has it, it is the tavern, speaking of which, the tavern is really powerful, it is a tavern on the surface, in fact, it involves a lot of business, and the materials that Zheng Yichen needs are not lacking in some rare items that are difficult to buy.

But in the way of this tavern, I quickly got what I wanted, although it cost a little more, but compared to delaying the time, those extra costs are nothing.

When Zheng Yichen buried his head in drilling for research and development, Petty was found by some people, and after Zheng Yichen solved a problem he encountered, he found that Petty had disappeared for two days, and he had no way to find someone, so he could only find the waiter in the tavern.

"Find someone, we're pretty good at this, but who are you looking for?" Zheng Yichen looked at the waitress in front of him, although she still maintained her customary smile, he could still see the subtle reaction contained in the expression of the waitress named Belin at this time.

"A girl named Petty, I'm going to find her. Zheng Yichen said in a deep voice, compared with the people in this world, Zheng Yichen knows that his experience in dealing with the world is too immature, and now he has also summed up an experience, when doing certain things, try to say less and do less, so as to avoid revealing more flaws.

"Yes, but I want to know why you're looking for her. Belin said.

Zheng Yichen thought for a moment, what Belin is talking about now is the price asked, if it is money, he will not care, but now it is such a problem, then it must be treated carefully.