The Kobolds are just like locusts, spreading everywhere. Because of their strong reproductive ability and their history as the best mining race, it's fair to say there are Kobolds all over the world.
No matter where they go, they can easily gather a large number of Kobolds to build their own city.
For the same reason, wherever the Kobolds go, they can easily develop into individual forces. How they spread is unknown, but they somehow carry their secret methods and various data and knowledge with them.
Some people secretly want to obtain the Kobolds' secret methods, but they find it's useless.
These Kobolds are so stubborn that no matter how much they're tortured, there's no way to get the knowledge from their minds. Moreover, they use special secret methods to protect their souls. If mental means are used, they will die on the spot. The resulting mental shock will also counterattack the enemies attacking their minds.
