Mystic Key

The Mystic Key, originally known as the Key, is a key item in Final Fantasy. The Elf Prince gives the Mystic Key to the Warriors of Light after they awaken him from his sleep. The Mystic Key unlocks various doors in dungeons, caves, and buildings.

Profiles and descriptions

 * Nintendo Power volume 17 (page 19): "The key will open any locked door, but you must awaken the Prince of Elfland to get it."
 * Final Fantasy Origins BradyGames Strategy Guide (page 18): "Opens magically sealed doors."