ASHEN - Black Ashen Feather 05 Location
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The fifth Black Ashen Feather can be found in Einarden Reach. This video shows the path to it from the Einarden Reach Ritual Stone.
This video is a part of the ASHEN - Weapon, Armor, Shield & Feather Locations playlist: https://www.youtube.com/playlist?list=PLsxfoGQwyeP42HmRSxCgVw5PASYMMbJxQ