Ple-Sen
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HotA is a mod that adds a pirate-themed castle.
WoG is a script that completely changes the units of the Conflux. Additionally, there were a couple of user-created scripts that replaced cities, for example, with swamps.
Phoenix mod - there is an option that randomly shuffles units between cities. It doesn't quite fit the definition of a new city, but it's still fun to play.
