Added a building: an underground entrance, which can be used to access the underground. There are some minerals and special structures underground.
Compatibility notes
If you install DLC or Biomes! Caverns, more special structures will appear in the game
If you want to add some special structures to the underground, just make a custom map data, then add the “Underground” tag to it, and then put it into your own mod,When generating underground, data with “Underground” will be extracted for generation.
Additional credits:
Code: HaiLuan
Art: aaaa椿
