Knight's Crest

Knight's Crests are items in.

Location and Uses
Knight's Crests are commonly dropped by Darknuts. They can also be looted from them using the Grappling Hook, but only when they have lost their armor. When Link arrives at Windfall Island in search of Bombs, he can visit the Postbox to receive a letter from Orca telling him to collect Knight's Crests. Once 10 of them are found, he may bring them to Orca at Outset Island to learn the Hurricane Spin. Afterwards, they can be sold to Beedle in his Shop Ship for five Rupees in and twenty Rupees in. They are kept in the Spoils Bag.

Trivia

 * A single Knight's Crest can be seen on a shelf on Orca's back wall. However, there is no way for Link to take it.
 * A great way to farm the Knight's Crests is to visit Ice Ring Isle and "defrost" the Darknut found inside. It respawns indefinitely, so Link can get as many as he needs for the price of a few Fire Arrows.