Moon Mirror

The Moon Mirror, named Mirror in the original release, is a recurring key item in the Mana series. It is typically used to reveal someone's true identity.

Final Fantasy Adventure/Adventures of Mana
While escorting Fuji to Wendel, Sumo decides to stop at the Kett Manor near the Marshes for the night. Upon staying overnight, the maiden mysteriously disappear during the hero's sleep. He hears other guests talking about a mysterious mirror kept in the depths of the sealed Marsh Cellar holding the power to reveal someone's true identity. He later finds the key to the cellar in the nearby Lizardmen's Nest and decides to venture into the dungeon. The hero is quickly met with a Mysterious Traveler who teams up with him all the way to the fearsome Hydra lurking deep inside the labyrinth. After felling the beast, the Moon Mirror is collected inside a chest.

Legend of Mana
Moon's Mirror (artifact)