Ether Medallion

The Ether Medallion is and item found in A Link to the Past. It is a magical crest that allows Link to unleash a powerful attack through the Master Sword, affecting the atmosphere in the area and freezing nearby enemies. It's magical shimmer can also briefly illuminate otherwise invisible walkways. Link must use its power to calm the storms in Misery Mire and open the way to the sixth dungeon of the Dark World.