When you start a campaign in Mount and Blade II: Bannerlord, you will need to choose your culture. The game contains six different cultures, and it's easier to think of them as factions. Whichever one you choose can give you some powerful bonuses, so think carefully about what you want.
Vlandiens
Western adventures descents that lived under the Empire for centuries before forming their own kingdom. As the Empire declined, they evolved into a well-organized feudal society ruled by a group of noble warriors who preferred to fight on horseback with spears and spears.
Bonus - 20 percent additional upgrade XP to troops in battles
Sturgiens
The descent of foreign tribes from the north of Calradia. As the Empire expanded into their forest lands, they discovered that they could sell their furs easily and quickly became reputable suppliers of these luxury items. The Sturgian leaders turned into princes with their newfound wealth, fighting wars among themselves with mercenaries from the North. Good hunters and wanderers, they are willing to travel far in search of trade or pillage.
Bonus - 20 percent less speed penalty on snow.
Empire
The Empire is in decline, something that was accelerated by the murder of Emperor Arenicos. The rival factions are now at war for control, but that cannot break the spirit of the Caladrains who make up the Empire. They are more advanced than the other factions, and these master engineers are experts in siege warfare.
Bonus - 20% construction speed bonus for town projects, wall repairs, and siege engines.
Aserai
The Aserai thrive in the deep deserts of Nahasa, wandering the sand between the oases as they develop their knowledge of horseback riding, medicine, and commerce. Proudly proud and jealous of others, they can be a force to be reckoned with when led by the right person.
Bonus - Caravans are 30% cheaper to build and receive 10% less on a trade penalty.
Khuzaits
The tribes that make up the Khuzaits exist in the mountain steppes but slowly settled closer to the Empire and shifted to a more agrarian culture. Yet they are nomads at heart, masters of archery on horseback and wartime escape tactics.
Bonus - 10% extra speed bonus for riders on the campaign map.
Battanians
The Battanians are fierce warriors who revere the woods and decry the advances of other factions in their woodland kingdoms. With painted faces, an affinity for foot combat, and unwavering loyalty to their traditions, they are fierce warriors.
Bonus - Forests give 10% less speed penalty to games.