And the Nightsong/Shadowheart confrontation is weird. I think this is old stuff because the narration is in 1st person still in it. I said it before, but the Nightsong seems to have two personalities: one pro-Shar and one anti-Shar...and both shows up in that exchange. She is warning Shadowheart that if she displease Shar too much she will end up cursed like her, but other lines are basically her telling Shadowheart to displease Shar...
Looking at Shadowheart story content, I can't decide if she's going to go totally batshit insane by the end or not. There is only so much conflicting gaslighting someone can process.
I got that vibe as well when going through the voicelines, but it seems to me that the Nightsong is posessed by Shar when she's saying the pro-Shar lines. The tadpole breaks this posession and then she start saying the panicked anti-Shar lines, until she is taken over again.
Also yes, Shadowheart is not even a person anymore at this point lol, just a tool the Sharran cult of BG uses to get the Gith artifact.