(old info may be updated but here is a loose idea on tribes)
Beginner- Simple thatch buildings smaller community trying to mind its business, grassy plains, hunts animals
Mountain- metal armor advances and lives unknowingly on a dormant volcano. Very confrontational and bullies smaller tribes for resources.
Water- Secretly very advanced has a big boat and island they live and trade with. Rarely allows others on their island. Has a secret underwater base only reachable with an air tank
Caves- Feral survivors in a cave due to the poisonous plants they have to survive on, believe past life glimpse are messages from the gods. Has "tamed" cave creatures that aren't usually tamable
Jungle- tree people work around nature and with animals some of the best tamers and medicine people come from here
Ice- Despite the cold environment they live in they're surprisingly a very kind and warm tribe. They help anyone lost in the mountains and train guard "dogs" for other tribes. They always bring tribes they're allies with big game kills etc for celebrations (like "christmas" and new years etc)
Desert: Has beef with the mountain tribe after a big battle has relocated to a canyon that is mostly protected by near constant sand storms. Trades rare desert items/offer to do odd jobs for the tribes they get along with in exchange for resources.
Secret Tech - High tech group that has activated some old alien ware and tries to keep it protected as they know the truth about this world and what would happen of the technology is reactivated (some may not be totally human....)