The opening
A wall collapses during renovations at a cave hotel, revealing a stair beneath the known underground city. The owner hires the characters to inspect it before the authorities close the property. Their guide, Derin, grew up nearby but seems to know rooms no modern survey has reached.
The new stair is worn on the underside, as if generations climbed it from below. Warm air carries cooking smoke. Rolling stone doors close behind the party one by one, and Derin quietly removes his shoes to feel vibrations through the floor.
What the party is trying to do
Map the new passage, find the people living below, and reopen the route to the surface.
A route through the campaign
- Descend through shafts whose footholds face upward toward the surface.
- Find an inhabited district where murals describe daylight as a promised afterlife.
- Learn that Derin has been carrying medicine and messages to the people below.
- Reach a geothermal engine that keeps the lower city habitable but is beginning to fail.
- Face the city's guardian as it seals the surface route to keep both populations from competing for air.
Possible endings
- Open the route and negotiate a place for the lower city on the surface.
- Repair the engine and turn the tunnels into a bridge between both worlds.
- Seal one city away, accepting who will be trapped on the other side.
History and invention
Cappadocia contains rock cut dwellings, churches, villages, and subterranean towns including Kaymakli and Derinkuyu. Some underground communities served as refuges during periods of conflict. The lower civilization and climate engine are original fantasy, not claims about the real sites' builders.
Content notes: displacement, claustrophobia, resource rationing.
One change I might make to The City Beneath the City: let the helpful NPC save somebody early. The later betrayal hurts more when the kindness was real.
For a D&D campaign idea, The City Beneath the City leaves a surprising amount of room for the party to wreck the plan in a useful way.
We played a tabletop RPG adventure in Cappadocia last year, and the place did half the storytelling for us. This outline understands that.
I would ask each player what their character believes about inheritance before session one.
The best part of The City Beneath the City is that the antagonist can be right about one important thing and still be impossible to support.
sanctuary and confinement is such a strong pressure point for this story.
The second campaign beat in The City Beneath the City is the one I would build the trailer around: Find an inhabited district where murals describe daylight as a promised afterlife.
Saving The City Beneath the City for our next campaign.
That Cappadocia backdrop is doing real work here. It does not feel pasted onto a generic dungeon.
I would keep the real history notes for after each The City Beneath the City session. My players love checking what was true once the spoilers no longer matter.
The job in The City Beneath the City is to map the new passage, find the people living below, and reopen the route to the surface. There is a nasty moral problem inside that objective.
Session zero for The City Beneath the City: ask everyone what their character would never trade for safety. Then bring those answers back near the ending.
The 6 to 9 sessions length feels right for The City Beneath the City. Enough room to build suspicion without losing the thread.
I ran something adjacent to The City Beneath the City, but the party trusted the wrong faction almost immediately. I would keep that possibility open here too.
I would open The City Beneath the City right in Cappadocia and let the party find the first clue before anyone explains it.
I can already hear my group arguing over whether to open the route and negotiate a place for the lower city on the surface.