PEASANT
needs Town Hall.
FOOTMAN
needs Barracks.
ELVEN ARCHER
needs Barracks and Lumber Mill.
ELVEN RANGER
needs Barracks, Lumber Mill and Keep.
BALLISTA
needs Barracks, Lumber Mill and Blacksmith.
KNIGHT
needs Barracks, Blacksmith and Stables.
PALADIN
needs Barracks, Blacksmith, Stables and Church.
DWARVEN DEMOLITION SQUAD
needs Gnomish Inventor.
MAGE
needs Mage Tower.
FLYING MACHINE
needs Gnomish Inventor, Lumber Mill.
GRYPHON RIDER
needs Gryphon Aviary.
OIL TANKER
needs Shipyard.
DESTROYER
needs Shipyard.
TRANSPORT
needs Shipyard and Foundry.
BATTLESHIP
needs Shipyard and Foundry.
SUBMARINE
needs Shipyard and Gnomish Inventor.
KEEP
needs Town Hall and Barracks.
CASTLE
needs Keep, Lumber Mill, Blacksmith and Stables.
STABLES
need Keep.
GNOMISH INVENTOR
needs Keep.
CHURCH
needs Castle.
GRYPHON AVIARY
needs Castle.
MAGE TOWER
needs Castle.
GUARD TOWER
needs Scout Tower and Lumber Mill.
CANNON TOWER
needs Scout Tower and Blacksmith.
SHIPYARD
needs Lumber Mill.
OIL REFINERY
needs Shipyard.
FOUNDRY
needs Shipyard.