Essentially, the Deepworld refers to the collective subterranean post-Cataclysm world, sorta like the Underdark from D&D. This would be a future project to support characters like Troglobites/Dwarves and Rats. The idea is to create an environment in which a character would rarely, if ever, have to go into that horrible bright-and-burning Overworld.
If someone can come up with a better name than “Deepworld”, my Enhanced Hearing is ready.
The first thing that’s needed is Food. You can’t grow plants without food, so you’re limited to finding underground water sources and hunting Ants. I suggest that the player is able to plant and grow mutated strains of fungi (not Mycus, naturally) that’d grow underground in the dark, and in cool temperatures. Plump Helmets, if you will, to take advantage of that Alcohol Metabolism that Troglobites haves.
My second suggestion would be to increase the amount of below-ground caverns, similar to what’s already happened with the subway/sewer updates. Possibly allow wildlife to respawn, so characters can eat respawning supply of sewer rats to sate that carnivorous hunger.
Anyone else have any ideas?