The Countess knows the fates and goings-on of every noble in Revendreth. It is the best way to keep them in her debt.
However, she has a dark secret. Despite what she may say... she was once mortal.
We will need to find where she keeps her sinstone. No easy feat, of course.
We will need to gather some intel. The venthyr of the Chalice District are constantly gossiping. Collect their letters from the couriers until you learn something of interest.