The Carrion Crow is a divination card. A set of four can be exchanged for a random magic armour item with a life modifier.
Drop restrictions:
The Aqueduct
The Battlefront
The City of Sarn
The Ebony Barracks
The Western Forest
The Grand Promenade
The Ascent
The Blood Aqueduct
Colonnade Map
Courtyard Map
High Gardens Map
Promenade Map
Ramparts Map
Waterways Map