Curse of Strahd
Keepers of the Feather
Good-aligned wereravens opposed to Strahd.
This group of wereravens is lead by the Martikov family. They have hidden in the shadows of Barovia for centuries, opposing Strahd in any way they can. They are helpful to any who oppose the vampire lord, but cannot risk overexposure, lest Strahd root them out one by one.
Their stats can be found here