Nightmare Key

, also known as, and , are recurring items in.

Location and Uses
Boss Keys are one of the three standard dungeon items, the other two being the Compass and the Dungeon Map. They are generally harder to find than Small Keys and are used to open the big door leading to the boss' chamber.

In, NaN Big Keies are also used to open the Treasure Chests containing the dungeon's item. Also, doors unlocked by the ALttP: may not necessarily lead directly to the boss.

In, NaN Big Keies open access to the Dungeon's Nightmare.

In, the TP: from the Goron Mines must be put together by obtaining the three Key Shards from the Goron Elders. In Snowpeak Ruins, the TP: is replaced by the Bedroom Key, as said dungeon is actually the mansion residence of Yeto and Yeta.

In, Link must carry the PH: in his hands rather than inventory, making him unable to attack and vulnerable to attacks.

In, Link must carry the ST: in his hands rather than inventory, making him unable to attack and vulnerable to attacks. In some instances, NaN Big Keies are electrified and Link must have Princess Zelda possess a Phantom in order to carry them for him.