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Try to take out the accompanying Skree Griffon healer quick as the harpies (Raiders, Singers and Trackers) can put a lot of pressure on your party, so it's important that the fight not last a long time.
Does not spawn until after you complete the Destroy the Harpies quest to rid the area of fledglings.
This boss does not appear if you have the Destroy the Harpies quest active and terminate.