Above and Below Haunted

Your last village was ransacked by barbarians.

You wandered the desert, braved frozen peaks, and even paddled a log across the sea, kicking at sharks whenever they got too close, the baby strapped tightly to your back. Then you found it! Your new home. But as soon as you had the first hut built, you discovered a vast network of caverns underground, brimming with shiny treasures, rare resources, and untold adventure.

How could you limit your new village to the surface?