I used this in a game of my own, it was an actual feature of a domain of dread.
A dark lighthouse overlooks a swampy peninsula, the night is black and starless and the moon hangs yellow and obscene low in the sky.
The lighthouse is surrounded by shabby structures and silent animals with strangely human eyes that follow you as you walk.
Inside the lighthouse is an old man stirring at a pot of strange meat covered with furry blue mold.
"They have taken the light, down, down, in the darkest place below here. Without the light, the land is finished. Find it, find the light."