Long ago the Jade dragon, Yù, defeated and abolished the evil Dragon of Taint, Xié. In doing so she pushed back the Taint covering the land. The people were saved from extinction and the lands all united in honoring Yù by living by her teachings. She showed the people that the people themselves brought forth Xié with war, greed, dishonor, and all the chaos that they gave into. She told us that unity and balance was the only way to keep back the Taint, to keep us all safe. The people of all races listened and strove to live a life of Family, Duty and Honor, the guiding Teachings of Yù. Yù entered a deep sleep leaving the fate of the people to themselves.
But that was so long ago that the people forgot the struggles of the past. People forgot the sins and mistakes of our ancestors. Dishonor and greed, war and strife returned to the land. Over time, the people broke up the great kingdom of Sensō into many other kingdoms. The teachings of Yù became nothing more than myth and legend that not enough follow. The actual words are lost.
The taint has returned.
Taint is not understood all that much. There are rumors of Yōkai appearing in places. It is known that the taint spreads by those infected by it, the Yōkai themselves. It is also known that a dark mist will start to spread in lands where the Yōkai go unchecked. This mist spreads the Taint as well.
Most have never seen this themselves. If anything, it's a problem for far off lands. People still tend to act out of fear when it comes to the Taint.
The rumors talk of the taint and the damage it brings. Creatures infected with the Taint, or even suspected of being infected, are put down. It is known that Taint brings deformities and sometimes powers. It is also known that those with it go mad. Because of the unknown information of the Taint and the lack of any way to detect it, many healthy people have been thought to have the Taint and put to death.
Having the Taint is a mark of Dishonor for you and your family.
The Jade Dragon of history has been gone so long that most think of her as myth. She might even never have been real. Yet the image of her and the name is an ever-present thing found in stories and art. Her actual teachings have been lost to history.
Good and evil are not a concept taught often. One's own renown and reputation is often what drives most people. The three values that are driven into everyone is Duty, Family and Honor.
Duty is the most important and the only thing that comes before Family and Honor. Your loyalty to the nation and the Empire is to come first. You are a member of the Empire and you are a part of the whole. To betray or dishonor your Duty is a mark of shame you and your family can not live down. All your children will carry this shame as well as any family that does not disown you.
Family is the most important and you are nothing without it. Even if you are lower caste, your Family is what comes first. Your ancestors and your elders deserve respect and your words and actions represent your Family. All you do, you do for Family.
Honor is the most important and there is no living without it. Keeping one's Honor is more important than keeping one's life.
It is said that the many empires are breakoffs of the original emperor's family. They all have the blood of Sensō. In truth not much is known of other empires outside your own.
There are six caste groups: Ten'nō, Shi, Shang, Gong, Nong and Dorei.
The Ten'nō class is that of the Emperor or Empress and their family.
The Shi class is at the top of the social hierarchy, made up of the ruling class who hold most of the power in society. They often have the power to speak for the emperor in a region.
The Shang class is the land-owning nobles who raise armies for the governors and act as battlefield commanders during wartime.
The Gong class is artisans and craftspeople who make highly specialized items for the wealthy Shi class.
The Nong class is peasants who work on farms owned by the Shi class. These pay most of the taxes in the country.
The Dorei class is the slaves, often made up of the dishonored, the oni races or the captives of war.
You are born into your caste but not exactly stuck there. You (and normally your family with you) can go up and down caste in very rare cases when the emperor (or someone speaking for him) declares it so.
This runt of the litter is more than "he" seems.