I killed the Gigantic Braaaain! And then I went to Hell with Karlach. Couldn't give her up, we'll find a way to fix her heart while meting out some revenge on Zariel. I love my hot girlfriend (Wyll came too, he's ok).
You should try playing Descent Into Avernus with friends! It's a prequel. If they haven't played BG3, don't spoil it for them when playing, LOL. There are lots of interesting possibilities in this book. It's all about Zariel, though, that's her on the cover.