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Artillery Batteries use special mortar construction techniques and engineering provided for by this factory
~ Official BMC description
HeavyArtilleryFactory

The Heavy Artillery Factory is a Special Building that is required for the Artillery Battery upgrade. It costs City cash16,000, takes 48 hours to build, and gives 700 XP once construction is complete. It consumes Lightning thing-050 and a 1x1 tile space. It requires Level 21 to unlock.