Rank 0: Barbarian

A Barbarian (not to be confused with monsters, vikings, or pirates) is a civilization below the point of 1 OS, which means its population must be lower than 1,000. A barbarian's military is so much not like a regular military that they aren't even militaries at all. The stronger barbarians would probably be like a messed-up 1 OS country, a failed country that is strong, but not organized. Barbarians are normally not controlled by players, but sometimes they are (as Player Barbarians, a bit rarer than regular barbarians). They can raid your country, and to prevent this, a 2 OS defense system should be put up. You can upgrade your defense so much that they can't come in without getting obliterated.

Followed by: Rank 1: Small Tribe (1 OS)