I know I been kinda of sketchy about all the things considering magic that mixed in with technology. So, I'm going to let Erwin here let out all the information necessary to satisfy all of your thirst for knowledge in the story and why they still uses these medieval weapons.
Also, the story slows down when chapter 7 happens...
*Reasoning on why guns aren't used very often*
[Swords and of the such is classified as weapons that are still useable even after the invention of guns into this world.]
[The reason for this is because of magic or in other words enhance magic, allows for users of this ability to counteract long range fire from guns by increasing your reflexes.]
[This makes things hard for marksman to even get a proper hit on the person without being spotted by the enemy or having the bullet dodged.]
[Clearly, the marksman can just run away and shoot back right?]
[Wrong! The kind of weapons produced have to make the bullets quicker than the reflexes or of the such, while keeping the piercing power of the gun at high or the chances of breaking the enemies enhanced technologically armored is close to zero.]
[Rumaion is an marksman in all aspects, while facing the same kind trouble every marksman have to face, which is finding a suitable gun. And if you remember from the battle in the forest, he said is his weapon able to pierce the enemy armor.]
[Not only are the weapons producers for guns have to keep up with the more easy to use swords, they now have to make the gun of the highest of quality and that makes it expensive.]
[Making what seemed like a useful tools, having gone to the back burner of being used as an secondary when their melee weapons is useless.]
[The melee weaponry and full body armor has something, the guns don't have and that it's easy to place magic runes on them. This makes the melee weapons more prominent for the non-magic users in this world.
[There is a large rift for weapons of melee and guns, but you may ask papa Erwin, what about bows? Well, those weapons are used by the stealthy Forest Elves who have the necessary high affinity with magic so they are able to enchant it because of how easy it is, making them able to stick with the roots and boost up the powers of the bows.]
[Enchants is a large part of this world and has done multiple things for it but guns can be more power.]
[For an example, the sharpshooter from the very beginning was one of the Empire's veteran sniper with his ability to kill his opponent in one shot by predicting where they might go.]
[Now, that we talked about the reasoning for why guns aren't very popular, why not talk about some magic that is so used very often.]
[Magic is one of the key things in this world that lets this world's evolve technology at the same time degrade in another.]
[Magic allows the uses of high tier spells that is able to change the face of an battlefield. Making them one of the most seek out people in the world and making others afraid.]
*Magic*
[Magic is split into branches that sometimes come across each other or doesn't in some cases.]
[Lighting magic: The most rare kind of magic between magician as almost no one has an affinity with it and changes everything because of the speed of the spell.]
[Fire Magic: Most magician have this kind of affinity and makes them completely deadly for widespread AoE damage.]
[Water Magic: It's in the middle of being rare, while not being it at the same time but they have healing magic and very sharp magic that is in the middle between AoE or single target.]
[Earth Magic: The name of this magic has origin from the otherworldly person that came over and invented this type of magic. It uses the ground as the basis for the spell and has a somewhat destructive force in areas densely with ground material.]
[Plant Magic: People don't have an extremely high chance of getting this affinity unless they live in a forest. The magic manipulates plants to do multiple things, making it a versatile type of magic or a trap kind of magic at least.]
[Enchanting magic is more easier to do ever since, the invention of the Enchanter but had been only been remodeled to fit swords and the like only, after all you can only enchants guns if the person is skilled enough to do so and it has to be by a person instead of machinery.]
[Magician also have a longer life span than normal people and can live up to 1000 years given the time.]
[These are the more well known kind of magic that most know but their are more of them but branching out to include all of them is too much for Author-sama to handle right?]
Oh shut up Erwin and continue to give the info!
*The Empire and its neighbors*
[Ahem, let's continue on the information train that will now include knowledge of Luken Empire.]
[As you have been told by Aviana, that she is placed in the Lukan Empire surrounded by longed hair boys with pretty faces that can easily be mistake for an girl's.]
[What? Aviana didn't describe the features of the boy but only the color of their hair and didn't tell us how pretty they are. Well, when she wakes up I'm going to smack some sense into her...]
[Anyway, the Luken Empire is one of the powerhouse in the area with key provinces points that give them enough resources to supply themselves without the need of trading but will still do it for items they don't have.]
A case of content theft: this narrative is not rightfully on Amazon; if you spot it, report the violation.
[The Lukan military is spilt between three main battle groups that go from the navy, air, and the ground forces. Since, the Lukan is on the continent of Mora, they have to fight against neighboring countries for dominance over the country.]
[Making them a mostly ground based military but they still have a navy because of the threat of the United Fochlin Provinces and were thinking about exploring into a new part of the world.]
[Air power can't be used very well because of Super Long Range AA guns will fire upon the airplanes before they even get into range. So, jets, bombers, and gunships will be there to support is when the ground forces clear out the AA guns.]
[Okay, the Eight Sages of the Imperial, are also one of the most influential group of people in the Empire by far because of how they were able to stump out a coup a 50 years ago and made adjustments to the living standards of the people with the approval of the Emperor.]
[Speaking of the Emperor, they have a long heritage that goes way back to the warring days before the invention of guns, battleships, and airplanes.]
[The Emperor is no push over when it comes to fighting and can even challenging all the Sages and be even footing with them.]
[Making him one with the most fire power, when it comes to military affairs and can handle all sorts of problem across the Empire to international, economy, and military.]
[He is the most powerful man in the Empire and declares wars regularly on his neighbors to get the upper hand in the politics or else he would be sitting ducks at the moment.]
[There are multiple rivals to the Empire such as the UFP who are still the ruler of the sea and off the coast south of them, the Lunic Kingdom who is north of them and has deflected multiple attacks from them and has an unknown ruler that even the people don't have an idea about.]
[The Masoric Alliance who is a gathered up of multiple countries into one and is west of them. There is also the Eastern Federation that is just as you guess east of them.]
[There even more countries but they are further away from each one of these countries.]
[But Serith told me it was unnecessary to list off all of them because they would not come in till later in the story, also he should really stop acting like god.]
Shut up! I can act like anyone I want to be and don't you have more explaining to do before entering Aviana body again, or do you want to me turn you into a sex slave for ogres?
[Anyway! Now, that was over why don't we start explain about the races in question, since I keep using the Forest Elves for some of the examples.]
*Races*
[Races are split into even more races, so we will group a certain race with another for keepsake or else this will take the whole entire day.]
[Humans: They are the most well known out of the rest being one of having a large population and is able to build large scale nations that could overwhelm the enemy using number or try to get a technology advantage.]
[Demons: There is an rainbow of demons that vary from different powers with either brute strength or magic spells. Each of them having different looks that make them look completely different from one another.
[Elves: They are like the demons with the different kind of elves that have complete different looks from one another but one type of Elf which are the Dark Elves are considered demons.]
[Beastmen: They vary in different looks that have similar looks that represent animals for an example, they can have the same ears as an dog but everything could be look human.]
[Draconian: The predecessor of the dragons who are said to still be alive but are in hiding at the moment. They have similar looks as an human but one things makes them all stand out, and it is their sliver eyes that are slit.]
[Half-Beasts: Are animals that reached the pinnacle of animal evolution and transform into an human like form, while having the ability to go back.]
[There are other types of creatures but this is kinda of like an nicer form instead of the full list of things.]
[Serith can you please let me go already!]
What about no! And hurry up already and finish what's left so I can go back to finishing the next chapter!
*Currency*
[Fine, the most used country are bronze, silver, gold, and platinum.]
[The money system is simple because it goes like this 100 Bronze= 1 Sliver, 100 Sliver= 1 Gold, 100 Gold= 1 Platinum]
[Their are large coins that equal 5 of something.]
[For an example, I have a Big Sliver Coin that equals 5.]
[Well, that is all the information that is needed for you to understand now I can finally leave!]
Now, now don't get your hopes up because we still have to find you a suitable body so you can start hitting on Aviana.
[Fuck!]
Fuck Aviana or fuck me? If it's her, let's just say you got a lot of competition but if it's me...your dick is going to get chopped off.
[....]
....
Anyway, let's end this already and let the readers have all the info.
Bye, bye!