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Another idea for a building:
For a fee/once a week, transforms units placed inside into other random units of the same level.
Second:
Shipyard upgrade. For a smaller fee, moves the nearest ship to the city to where a newly built ship in the city would be located.
For a fee/once a week, transforms units placed inside into other random units of the same level.
Second:
Shipyard upgrade. For a smaller fee, moves the nearest ship to the city to where a newly built ship in the city would be located.