Donjon

From LSWiki

A little jail in the Exoma.

The door can only be opened from the outside. I seem to remember if you walk in for an insane reason, it will automatically close behind you. People most often get jailed here because they pulled the namesake card from the Deck of Changes.

You draw the Donjon card from the deck of changes.
a stone cell [s]
This is a featureless stone cell, about five meters square.
A haze of shifting, flickering motes of whiteness obscures your vision.
The only obvious exit is south. 
There is a closed steel door here, leading south.

The most common way to escape is begging people to save you. The door is locked.