In Terra Mystica each player governs one of 14 factions trying to develop more successfully than their opponents. Terra Mystica is a magical world: its inhabitants are able to transform the terrain they are living in. Each faction is bound to a specific type of terrain: It can only build structures on its “Home terrain”. This is why each faction over the centuries needed to develop Terraforming capability.
 
In the game, the players need to expand to build Dwellings. However, as they gain Power when another player builds Dwellings or upgrades Structures directly adjacent to them, each player has to face the challenge of finding the right balance between adjacency to other players and free space for expansion