Tribe - RyanBabij/WorldSim GitHub Wiki
A Tribe is a collection of nomadic Characters which have an allegiance to each other, typically in the form of family bonds.
Tribes are the precursor to Civs. Tribes are greatly limited in their ability to grow in power. Tribes are nomadic, and therefore have no place to keep wealth or resources. They use what they can find, and then move on.
Once Tribes meet certain preconditions, they may convert into Civs.