Ravenfolk

The Ravenfolk are distant relatives of the Kenku. It was said that tribes of the Ravenfolk were drawn to the Shadowfell by a mysterious voice that promised them an end to their curse. With this promise many kenku dissappeared from the material plane and were found later as changed Ravenfolk in Shadowfell.
While they mostly integrated into Shadowfey society the biggest accumulation of them can be found in the Corvus Kingdom.
A growing proportion of ravenfolk have joined a mystery cult in the Shadow Realm; some claim this cult is new and others that it has ancient roots and is just now being revived. These ravenfolk call themselves Listeners of the Songbird and reportedly are drawn by a mysterious psychic song. Their numbers are still few, but more arrive along the shadow roads from the mortal lands regularly, waiting for the unknown singer to reveal their intentions. This network is highly secretive about the details of their mission, but so far, they have not conducted open hostilities against the other peoples of shadow.