Sundering of the Dessarin Valley
In the Sighing Valley stands Feathergale Spire, the Haunted Keep inhabited by the Feathergale Society, Waterdhavian aerial-mounted enthusiasts who have pretensions of nobility. They call themselves the Feathergale Knights.
The party has encountered the society, feasted with them, and even hunted a great Manitcore. The society boasted their goal was to prevent those that are unjust from having their way, to bring about a freedom to the people of the Sword Coast.
The Spire is lead my Thurl Merosska, and his word is highly respected among the ranks of the knights. A fledgling knight by the name of Savra even offered to speak to Thurl about granting the party membership into the Feathergale Knights.
Cyril and Alduin later informed the party that The Feathergale Knights are a cover-up for their true purpose as The Cult of Howling Hatred. A group of elemental air worshippers.