This is an expansion and requires the base game to play: yes

Expands Heroes of Land, Air & Sea to support 7 players. Features a floating continent, held above the board with clear plastic stands, and a sunken continent, achieved by laying a transparent blue sheet over an existing island.

Includes 2 new factions: the Birdfolk and the Merfolk, 20 new spell cards, 24 new exploration tokens, and components for a 7th player.