No really, Spoiler. Start embark...blam HFS, and major lag.
"You have discovered an eerie cavern. The air above the dark stone floor is alive with vorticies of purple light and the dark, boiling clouds. Seemingly bottomless
glowing pits mark the surface."
...and I'm standing over a cliff looking into the abyss, with my back to a human house full of cheesemakers. The house is surrounded on three sides by "rough slade walls"

That tiny green adventurer is me, and the grey wall to the SW is slade.
So... anyone? Nothing fancy with worldgen. I'm about to attemp a dive for !!Science!!