A Healthy Sheen  

While in the Great Divide, use the Stormfeather's Pride Griffawn Feather that you received for completing Wing Wranglin', hail the griffawn pet and choose "Let's clean your coat." This is one of five dialogue choices that are used to train your griffawn into a flying mount, and these dialogues can be chosen once each and in any order every 18 hours.

1. Kill 8 ancient shardwurms, shardwurms or young shardwurms, all found east of Dain's Last Stand around 179,-256,-165 Copy

Once you have all 8 updates, hail your griffawn and the quest will auto-complete.

If you have not done all the side-quests yet: in 18 hours you can pick another training lesson for your griffawn!

If this is your final side-quest: Congratulations! Hail your griffawn pet and you will receive another "Quest Complete!" box where you can pick your new griffawn mount, as well as receive some more experience and money. Choose from: Snow Gryphon, Highland Gryphon or Tundra Gryphon. The Stormfeather's Legacy quest series will now be available from Hircus.