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.
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