Steblow
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To build the Cage of Warlords (which grants +1 defense to any hero who visits the main castle) in the Swamp castle, you need to build the Town Hall and Glyphs of Fear. Isn't that a bit too complicated for such a simple building, especially considering that similar buildings for other factions are clearly easier to construct? ... And as a result, no one buys this building in the Swamp.