PEON needs Great Hall.
GRUNT needs Barracks.
TROLL AXETHROWER needs Barracks and Lumber Mill.
TROLL BERSERKER needs Barracks, Lumber Mill and Stronghold.
CATAPULT needs Barracks, Lumber Mill and Blacksmith.
OGRE needs Barracks, Blacksmith and Ogre Mound.
OGRE-MAGE needs Barracks, Blacksmith, Ogre Mound and Altar Of Storms.
GOBLIN SAPPERS need Goblin Alchemist.
DEATH NIGHT needs Temple Of The Dammed.
ZEPPELIN needs Goblin Alchemist and Lumber Mill.
DRAGON needs Dragon Roast.
OIL TANKER needs Shipyard.
DESTROYER needs Shipyard.
TRANSPORT needs Shipyard and Foundry.
JUGGERNAUT needs Shipyard and Foundry.
GIANT TURTLE needs Shipyard and Goblin Alchemist.
STRONGHOLD needs Town Hall and Barracks.
FORTRESS needs Stronghold, Lumber Mill, Blacksmith and Ogre Mound.
OGRE MOUND needs Stronghold.
GOBLIN ALCHEMIST needs Stronghold.
ALTAR OF STORMS needs Fortress.
DRAGON ROOST needs Fortress.
TEMPLE OF THE DAMMED needs Fortress.
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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