I notice that the sadistic trait only works in the dungeon, it there any chance that restriction could be lifted? Even if it's buying a book allowing it to be used anywhere.
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Maybe my phrasing was off, it's the part about only the dungeon getting scenes requiring the Sadistic trait I was talking about.
I was not aware of the bonus not being Dungeon-specific, though. The tooltip mentions a specific building and the stats but nothing about unlocking scenes, so I assumed the bonus was also linked to the building.