The happened to me as well when I was doing a Dark Urge playthrough, but not as regular Tav. I redid the final boss sequence on Durge and the same thing happened.
When I went back to the netherbrain, when you tell Emperor/your mindflayer party member to destroy the netherbrain, I watched my own HP go from almost full to 1 HP.
I got to the cutscene with Astarion, and it *looks* like it's all black, but you just need to rotate the camera, and you'll see you're actually in the room with him and he's speaking. Your Dark Urge character is actually Stunned. They have a yellow ring around their heads and they're clasping their head. If this is intentional, I think it's because Durge rejected Bhall and only has very little of their own soul left. When you told Emperor to destroy the brain, it's like psychic backlash. That's my guess, otherwise I have no idea why my HP dropped to 1.
The cutscene works fine on my normal Tav though. Although, armor-wise my normal Tav had Constitution 23 and Strength 23, and I was wearing a full set of Helldusk armor (from killing Raphael), so she may have been better protected.
Last edited by Lillith; 24/11/23 02:37 PM.