If you are playing the game after the flow of the story, how do you get to Ethel without harming the masks?
There are various ways, the easiest I’m aware of is …
I would advocate that easiest way would be to activate "non-lethal attacks" ...
Sure, they are story-wise concidered dead (meaning there is no futher interaction with them and they dissapear after Long Rest) ... but you still "know" you didnt kill them.
