Auryn
From Jenny Everywhere Wiki
The Auryn was a medallion that bore the symbol of the Childlike Empress, ruler of Fantasia. It had the ability to grant wishes. However, it also took away people's memories with each wish they made. When the Empress wished for a way to escape the destruction of Fantasia, the Auryn took away all of her memories and crumbled to dust. (PROSE: The Truth Behind the Lie)