An Ergastulum is a building used to hold in chains dangerous slaves, or to punish other slaves. The Ergastulum is subsurface and large enough to allow the slaves to work within it and containing narrow spaces in which they sleep.
Ergastulum - Sleep
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Description
Revisiting an older game mechanic that let you Sleep in the game to visit the Dark World. This was dropped a while ago due to problems but I really want to make this work.