Great annihilation is the turning point in all history of this world and the beginning of today's so-called "deep sea era".

According to what Nina said, Duncan finally roughly understood what kind of shocking changes had happened in this world, and realized that the world was not as strange and dangerous as it is now.

According to historical records, the world before the Great Annihilation was a paradise of prosperity and security.

The oceans at that time were not "unlimited seas". At that time, the limited sea water did not occupy more than 95% of the world's surface as it is today. At that time, humans were still living on vast and safe land, and even in the ocean, there were no dangerous phenomena such as spiritual world, deep and subspaces.

The "Era of Order" recorded in history books gives Duncan a more familiar world - although modern people will look back at the ancient times when "abnormality" is not present, for Duncan, the appearance of this world today is completely wrong.

There is no detailed explanation of the key event of "Great Annihilation" in history books. Although the archaeological community has been making efforts in this regard, the great differences between various city-states and ethnic groups on ancient history have always existed. No one knows how the so-called Great Annihilation happened, nor do they know what the essence of the disaster was - huge chaos and fog shrouded the drastic change, and after the fog, it is the current deep-sea era.

The sea water from somewhere has submerged more than 90% of the land. The remaining survivors of civilization have established city-states and fleets on the remaining archipelago and small pieces of land. The vast sea and the fog on the sea have brought about strange things called "abnormal" and "visual", which are still threatening the existence of civilization.

But Nina didn't know that there was a ghost captain from a foreign land in front of her, who was drawing knowledge from her words. She only thought that this was the uncle who was testing her homework. Uncle hadn't had such a good mood for a long time. She just felt very happy and even felt that this moment was particularly precious because she was worried that when Uncle Duncan would change back to what he had before... And based on past experience, this was almost inevitable.

As long as the spirits lose their effect or the painkiller is taken, the uncle will become particularly irritable, irritable, and hysterical.

So before Uncle Duncan fell ill again, she wanted to show him all her progress - this might have allowed him to have a good mood for a day or two more.

"... Mr. Morris is very interested in the history of the Kingdom of Crete. He is an expert in this regard. He told us that although the ancient Kingdom of Crete only lasted for a hundred years, it was the first civilization to stand up from the ruins to fight against abnormalities and visions after the arrival of the deep-sea era. The experience they have explored for a hundred years is still guiding most people in the world today - the most important of which is their classification method of 'abnormal' and 'visions'..."

"Did you classify 'abnormal' and 'abnormal'? Have you learned this?" Duncan raised his eyebrows, not forgetting to guide him in his words.

He was very concerned since he heard it, and then he became more and more convinced that in the eyes of ordinary people in this world, those unreasonable things should have a strict distinction. Some things are called "abnormal" and even numbers, but others... seem to be called "abnormal" alone, and unlike his previous impression, they are all generally classified into "abnormal".

He had never heard of this detail from the Goat Head on the Lost Country before, and now what Nina learned in school can finally make up for his common sense shortcomings in this area.

Nina nodded, recalling what she heard in class, saying, "Mr. Morris taught us the easiest way to divide abnormalities and visions is scale.

“Generally speaking, the size of an abnormality is often limited to one object, an animal, or even a ‘human’;

"Most exceptions can be moved artificially and have a limited scope of influence. Many exceptions can even affect only one target at the same time. When mastering specific methods, most exceptions can also be safely sealed or isolated - some of the more harmless exceptions can even be 'utilized' through specific methods like tools.

"The scale of vision is much larger than that of anomalies. The smallest vision is as big as a house. The larger ones can cover the entire city-state, even larger than that... it is unimaginable.

"A considerable number of visions cannot be moved by humans. They are either fixed in one place or operate according to their own will, and their influence ability is far beyond the abnormality. Usually, visions can affect infinitely many goals within their own effective range, so that they can almost be equated with "natural phenomena", so that the name "vision" is given.

"Unlike abnormalities, almost all 'visions' cannot be sealed or controlled. They exist in the world like natural phenomena, operate without interference from outside world, and naturally affect all targets that meet the conditions within the scope. Since most visions are dangerous, all people can do is stay away from these dangerous visions, or avoid becoming the effective target of vision through specific methods...

“Luckily, those most dangerous visions don’t usually move, and the pioneers help us find out these dangers and we can safely distance ourselves from them…”

Nina said very seriously, then seemed to suddenly remember something, and quickly added: "Ah, by the way, the old man also mentioned to us specifically that these judgment methods and characteristics are only 'usually effective' - abnormalities and visions are unreasonable. Therefore, no matter how people summarize their experience, there will always be abnormalities or visions that do not meet the definitions suddenly appear. Sometimes the abnormalities and visions will even be interchanged, and there are also situations where visions are interfered by humans and eliminated.

"For example, in the 1830th year of the new city-state, there was an abnormality called the 'myhypha' in the city-state of Lenza. The local church guards exiled this out-of-control abnormality to a nearby island at a great cost. The island was recognized as a promotion to a vision in 1835, which was the subsequent fungal island. But in 1844, the great saint Paladin contained the fungal island in his urn at the cost of his life, so the vision "Fungal Island" was removed from the list in the same year, and it became a "abnormal" again, called the 'Paladin's mushroom bottle', and is now sealed in the underground relic library of the cathedral of the Lenza city-state..."

Duncan listened to everything Nina said with all his attention, his mind moving rapidly, while concealing the ups and downs in his heart with a calm expression.

In this short breakfast, the information he collected exceeded the sum of his past few days on the Lost Country!

Establishing exchanges with the land and setting up an outpost in the surface city-state is indeed the correct idea - a civilized society is the summary of most of the world's intelligence!

He subconsciously looked at the girl who was still talking in front of him, and had a lot of insights in his heart.

A civilization that has developed normally to the industrial stage will definitely find ways to compress and summarize the basic knowledge of social operation in its own educational system. It may be difficult for a child living within this system to realize what kind of treasure house the textbooks they come into contact with on weekdays:

That is the knowledge accumulated by countless people over countless years, and through years of sorting and integrating it into the most suitable structure for learning and absorption. Those books are the most exquisite "nutrition compression pack" in the world, in order to make a piece of white paper quickly become a part of society within the minimum time and energy cost.

Even Nina, who usually loves learning, cannot understand this point - only Duncan, a "outsider", can realize how precious and easy to absorb this knowledge.

But Nina didn't notice what Duncan was thinking. She just remembered what her respectable history teacher once said in class-

"... So Mr. Morris told us at the end of last class that people have summarized countless laws in the process of dealing with "abnormality" and "illusions", but only one law is truly and forever effective, that is, "no matter how many laws we have summarized, there will be abnormalities or strange phenomena that do not conform to the law appear in the world."
Chapter completed!