Which of these is a dungeon only accessible from a hatch or hole in the ceiling?

I think it’s from the French “oublier “ meaning to forget

It must have been terrifying to be put into one of those places. It would make me absolutely freak out

yeah, but how do you pronounce it?? 🤔

‘Oubliette’ is French, meaning ‘forgotten’.

Yes. Put someone in there and “forget” them.