Helmaroc Plumes are items from The Legend of Zelda: Phantom Hourglass. They bear a slight resemblance to Golden Feathers from The Legend of Zelda: The Wind Waker. These Treasures can be found randomly throughout the World of the Ocean King, and can be bought from Beedle. Link can sell Helmaroc Plumes to the Treasure Teller on Mercay Island for a random but fixed number of Rupees. It can also be sold to the Ho Ho Tribe on certain days. Given their design, they are presumably the tail feathers of Helmaroc King.