The Wars of Reaving are past. The Homeworld-sweeping wars have irrevocably changed the survivors. Four Clans look to rebuild their shattered society and prepare for their possible return to the Inner Sphere. Changes in political views, the tools of war, and tactical outlooks are discussed, as well as distant threats both past and future.

The Wars of Reaving Supplemental also includes Random Assignment Tables for the Reaving era and beyond, a short Strana Mechty mini-campaign, and fifty-one record sheets of units used throughout the conflict, including new OmniMechs and ProtoMechs introduced in The Wars of Reaving sourcebook.