The Adventure Seed
Lost Hippies of the Catacombs
Several years ago, a charismatic New Age guru gathered a group of followers to establish a Utopian community in the secret network of tunnels underneath The City. At first the City Government tried to force them out, but they secreted themselves so securely, that eventually the authorities decided that they weren’t hurting anybody and driving them out was more trouble than it was worth.
For a while the community prospered, only occasionally making contact with the surface world to trade for goods. Then all word from them ceased.
Your party has gone down into the catacombs; perhaps at the request of the City to find out what has become of the commune; perhaps you just happen to be exploring the tunnels for your own reasons. You find the community, but there is no one there. You find homes, evidence of underground farming and cottage industry, meals set out to eat, but no people. Not even any bodies of people who might have died. Nothing.
Did the community migrate to some spot deeper underground? Or is there something down there that took them.
The answer might lie in the large stone idol in the largest cavern.
Or maybe not.