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.
Knock knock... i'll try the other door...
Looks really fantastic so far. I'm not too big of a fan of that 'digital' glitch that occurs here and there: 0:58, 1:14, 1:23. I feel like that sort of effect gives the impression that you're in a digital world or that the character you play as is digital themselves. Maybe try a red vein texture, giving the impression of bloodshot eyes, and follow it with a sort of whining or maybe coughing sound?
Thanks for looking and the suggestion :)
I do have a vein texture, used for health indication but I do like your idea so I can probably work something up :)