The thane of Wyvern Hold, so the story goes, had a vision and in it he beheld his clan, sleeping, deep in their cups after a feast. And as he watched, they transformed one by one into serpents. The only ones who escaped this fate were those snatched up by eagles and carried away.
The thane took this to mean that a terrible calamity would befall his people and that only the Lady of the Skies could save them. So the Wyvern clan forswore all other gods and devoted themselves to the Lady.
But the other Avvar clans feared that the disrespect of Clan Wyvern would bring the wrath of Korth the Mountain-Father upon their people. The other thanes tried words and then blades to change Wyvern's ways without success.
When the Tevinter Imperium came with their legions to claim the mountains, many clans were wiped out, enslaved, or forced to flee across the Waking Sea to the south. Clan Wyvern, however, was not among them. They simply disappeared. And to this day some Avvar thanes will tell you—if they have had enough mead—that the last any soul ever saw of the Wyvern clan was a great flight of eagles descending to their hold.
—From "Tales of the Mountain-People," by Sister Petrine, Chantry scholar