This is an expansion. A copy of Root the board game is required to play.New factions and battlefields join the world of Root! The Underworld Expansion includes: The Great Underground Duchy: an imperial faction that mixes the flexibility of the Marquise with the escalating Eyrie Dynasties. The Corvid Conspiracy: a secretive faction that hatches plots directly into the hands of their opponents. Two new maps: dig tunnels on the mountain map or fight to control the ferry on the lake map. CONTENTS Booklets: "Learning to Play and this Law"Cardboard Pieces: 6 Buildings, 19 Tokens, the Burrow, 4 Relationship Markers, 2 Victory Point Markers, 6 Closed Path MarkersWooden Pieces: 35 Warriors, 1 Ferry, 1 TowerCards: 9 Ministers, 2 OverviewsOther: Board (Lake and Mountain Maps), 2 Dice, 2 Faction Boards (Duchy, Corvid)