I didn't know, you could save the other masks. So far, I only managed to save the halfling Lady, who promised me free drinks in the Elfsong tavern.
She was the one I managed to save, too. I hope I'll have some time tonight to try this fight again. I don't think I will be able to finish this playthrough before the new patch comes out, though
For the other masks “save” is relative. You can kill Ethel while they survive, but they are too far gone and refuse to remove their masks or leave Ethel’s lair, or at least that was the case in the earlier patches.
In patch 8 at least, the masks also remained hostile after I killed Ethel, and I had to run away through the portal and return afterwards before they would stop fighting and talk to me.
When I reported this as a bug, I was told it was intended behaviour which seemed bizarre to me as surely only people who already knew a mask could be saved would bother running rather than killing them, so I’m hoping this has been reconsidered.
