Black Chamber, softback adventure for Lamentations of the Flame Princess, by Becami Cusack
“There’s a black chamber: soot covered, blood spattered, encrusted in grime.
Once you’re inside it, conquistadors enter to exterminate, blood and boiling mud come pumping in, spikes and blades emerge.
But the real dungeon is beyond the black chamber, past the shifting walls.
Any party worth their salt will escape the chamber, and enter the mechanism that moves it.
An adventure for Lamentations of the Flame Princess Weird Fantasy Role-Playing and other traditional RPGs.”