FitzTheRuke
Legend
One idea that might have legs, and combines a lot of the above:
A setting where the "civilization" is along a rocky shoreline, with a mountainous interior (full of monsters, naturally) that has developed submersibles (like Spelljammer under the sea) and underwater exploration is one of (but not the only) big draws for adventure.
Of course, down there are fallen kingdoms, indigenous sentients (both friendly and unfriendly), natural hazards, and both great beauty and great horror.
A setting where the "civilization" is along a rocky shoreline, with a mountainous interior (full of monsters, naturally) that has developed submersibles (like Spelljammer under the sea) and underwater exploration is one of (but not the only) big draws for adventure.
Of course, down there are fallen kingdoms, indigenous sentients (both friendly and unfriendly), natural hazards, and both great beauty and great horror.
