Mine holes: expand the way mine holes can behave
- Standard ladder mineshaft- Make the current, ladder based mine hole the default, but make the ladder retractable. When the ladder is retracted, people will know there is a mine hole either by a different ground graphic, or by the light coming from above. Optionally, make the ladder destructible.
- Stone staircase- operates similar to the ladder mineshaft, but cannot be retracted.
- Elevator- Anything on the elevator space is teleported to the other z level when a switch is activated. This could include chests or carts. The other level should be clear for it to work, but there could be an additional ladder for people to use.
Authority Objects
- Have an authority object that creates authority in another level. This could work by having authority objects connected to mine holes or cave entrances. Once the object is built, both sides of the mine hole or cave entrance are covered by village authority, and the village can expand in the new level by using traditional authority objects. This object could be represented by a big chain or rope that connects the areas, or maybe a pair of mirrors, or linked flames or something else.