... I'm hoping that topic title was vague enough to avoid spoilers.
There's a bug with Hexxat's daylight damage script. You can reproduce it like so:
1. Have Hexxat stand inside a building during the daytime while not wearing Dragomir's Cloak. 2. Have Hexxat step outside (into the daylight). 3. Have her immediately step inside before the damage script triggers.
Hexxat continues to take damage while inside until she dons Dragomir's Cloak.