My plan to control Ethel was not very successful. I got only a 40% chance to apply control spells (Hold Monster, Polymorph, Fear), even with disadvantage for Ethel, and was not willing to waste time and lvl 4/5 spell slots for it. I have + 14 to spell attacks, how do you get more?

Other than that the Ethel fight was so easy, I'm now ashamed we ran away the first time (mainly because I had thought that all copies really had Ethel's hp of 140). We destroyed something, then Shadowheart threw something, then Alicia (my main) killed Ethel with a Witch Bolt. Which I find fitting.