Nightmare Key

, also known as, Boss Room Keys, and ,  are recurring items in.

Location and Uses
NaN Big Keies 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 addition to opening doors, NaN Big Keies are also used to open the Treasure Chests containing a dungeon's item in. Doors unlocked by the ALttP: may not necessarily lead directly to the boss.

NaN Nightmare Keies open access to a Dungeon's Nightmare in.

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

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

ST: must carry the ST: in his hands rather than in his inventory in, 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.