From the introduction:
Welcome to the world of Polytopia, jumper. Soon, you shall be arriving in a square planet the size of a small country, where you will take control of one of the 12 native tribes in their bid for power, as they each compete to become the strongest civilization.
From the throne room of your tribe’s capital city, you will lead your people by building cities, overseeing battles and developing new technologies over the course of your time here. Make sure you keep an eye on your capital city, as if it is successfully conquered by an enemy tribe, you will lose the jump, even if they elect to spare your life.