"There are only 346,120 books," answered Charlotte.
"And you have read all of them?"
"Of course not. Even two hundred years is hard to actually read all these books by myself, let alone if I have to add more knowledge about the recent understanding. I have only read around half of them."
"Almost a thousand books a year is impressive, you know." Nathan shook his head helplessly. "Then, do you know the content of all those books?"
"What do you think? I don't have a photographic memory. Even if I can record all this book, there will be some losses once I'm integrated back into my main body." She sighed. "However, I understand the general knowledge of those books. If I don't know something, I will simply open those books again."
"That's amazing." Nathan looked down, falling into deep thought. "What kind of books do you have here?"
"All kinds of things, from basic knowledge to advanced stuff like engineering or unique techniques."
"That's amazing. The ancient techniques must be awesome. They will exert a strong attack..." Nathan abruptly stopped when Charlotte stared at him intensely.
"I don't know what kind of misconception you have, but it doesn't work that way." Charlotte sighed. "A technique is made, recorded, and improved. As time passes, they will gradually improve the technique, making it as perfect as possible or even surpass the imagination of the original creator.
"A few people who come to this library have shown those improved techniques, which are more efficient and powerful.
"I don't know where you get the idea that an ancient technique must be useful. Does the world actually progress backward?"
Nathan couldn't really refute that argument. Instead, he was cursing, 'I learn it from those cultivation or fantasy novels. Then again, those books are usually created by ancient sages who were one of the strongest people in their time.'
"Let's treat it as if I have never said anything." Nathan looked away.
"If that's the case..." Charlotte came to him and whispered with a seductive tone. "...how about I teach you personally?"
Her voice made him feel goosebumps. While looking away, he asked, "Can you stop seducing me?"
"So you don't want to?"
"I'm just asking, not rejecting."
"What an honest boy. How cute." Charlotte had a sly smile on her face. However, her face soon turned serious. "Let's see. First of all, what do you think was happening before the aliens invaded us?"
Nathan stopped. From everything he had learned on Earth, there was only one thing that would happen before the aliens invaded this world.
"The humans were fighting each other." Nathan answered with no hesitation.
Even Charlotte looked surprised. "Correct. Before the aliens invaded this world, the world was in turmoil. Humans fighting with each other. A lot of people were dying from famine and sickness. It was one hell of a world.
"There were four kingdoms that dominated the land. The Ancient Irisvial Kingdom had ruled the north for over two centuries. They were the youngest among them, but also the fiercest. They forced their citizens to fight and expanded their border to the point where they could rule a third of the world within that short amount of time.
"The one who was opposing the north was the Ancient Rodokhaune Kingdom. They were inviting all sorts of talented men to work for them, creating a utopia that progressed the world's technology.
"The third kingdom ruled the west, the Azilia Kingdom. They were the smallest kingdom out of the four, but they were the most robust. Their citizens were happy, and their soldiers were fairly strong. Even though they were not the 'most,' they had a good balance of everything. As a proof, the Azilia Kingdom was the only one that survived to this day.
"Last but not least, the kingdom of the south, who was the first one to get devoured by the aliens. From what I've heard, the current north is known as the Land of Death. However, the original land of death was actually coming from the south. The current north was just an imitation of that land.
"And it could be said that the south was much more terrifying than the current land of death in the south. This kingdom had one absolute ruler, and instead of a king, the leader chose to call himself Asura."