Feathers in the Wind

Ravensong guided you well, and now that you have secured Talabecland for the Raven Host, the way is clear for you. Raven feathers, black as night, write a song dark and grim. They blow with the winds from the north into the Empire, but the Empire resists. From the south a song is riding the wind that does not embrace the Change to come. Talabecland is ours, but it resists. Not the people, for they are broken husks, but the beasts. No beast causes Tzeetch more angst than the dreaded griffon. Slay the Bleakwing Matriarch that we may cast her feathers into the wind and use them as a harbinger of the coming tide.

Find the lair of the Bleakwing Matriarch and slay her and her kind. They are an affront to the ways of Tzeentch and must pay with their lives.