The Tribe 8 Companion is a major supplement to the Tribe 8 game line, providing new source material, Weaving advice, advanced rules, and quests. It includes:
- Information on the tribes of Joshua and Mary, including Player Character creation guidelines and new Synthesis abilities;
- Details on Quest Circles, along with rules and advice for running tribal (as opposed to Fallen) cycles using Circles;
- Expanded information and PC generation rules for the Keepers;
- Two complete quests, one involving a dying Z'bri and the other an ancient relic of Mary and Joshua;
- Overviews of the populations and economics of all tribes;
- Expanded combat rules, covering shields, paired weapons and special maneuvers;
- New weapons, including automatic weapons and partial armor;
- Clarifications of the Synthesis magic system.