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Undercity Empires

Have you ever tried to form a continent-spanning Under-Empire, but felt like you were arbitrarily restricting yourself, since Undercities were mutually exclusive with settlement ownership, and most of their buildings were expensive, low reward, and high risk, always getting blown up when the parent settlement's owner failed to defend its own capital? Or maybe you're just interested in tall play, as a bit of a change from traditional map painting? Either way, this mod might be for you.

You'll still need a few seats of power for proper recruiting - I'd advise using the excellent TWW Hub[twwhub.dev] to find a few landmarks to base yourself around - but the lands between can now be as they should be: other empires farm while you feast.

• Undercities are no longer destroyed when the settlement above it is razed, same as the Changeling's trickster cults.
  
  
• You can even have Undercities under your own settlements, but many buildings now cost the parent settlement food and income, so this is not necessarily a great idea unless you're running a surplus. Probably better to sell it to a nearby chump valued ally and let them bear the costs.
  
  
• Tweaks to individual buildings to make ongoing fighting in unowned but Undercity-infested territory easier (for you, that is. Not for everyone else), and in general, buildings that are high Discoverability are cheaper and quicker to construct and upgrade. Now there are clearer options to move fast and break things if you don't mind being caught, or slowly invest in staying well-hidden. For a full list of changes, check the Change Notes.

• Multiplayer - yep
  
  
• Existing saves - turning it on yes, turning it off midgame might be less elegant
  
  
• Other mods - probably yep, unless they also change Undercities