Auntie Ethel's storyline and everything surrounding it (tie-in letters, the stoopid Gur, the "sheep"...) is a masterpiece from beginning to end. So mythical, so creepy, what a well-written villain.
The Underdark was... unexpected. I thought that the game would end after the party, but nope, it didn't, and suddenly I'm Alice in Wonderland but make it deadly. Astarion also delivered his most malicious, sheer evil lines to date in there, he's shaping up to be an extraordinary villain if the game branches that way.
I got stuck alone in the Underdark Tower, exploring it to my leisure, and it was a fantastic moment; it almost felt like a different game. Very refreshing.
I liked how sad and lonely the Grove feels after the Tieflings leave; they truly brought a spark to the place that the druids can't recover, and that harp, the abandoned objects, makes the scene feel so melancholic. It was a great touch.
And of course the pets.
