Erato knows of a story about Alukina's Palace. There is a ward on the place that uses some sort of mirage magic. She gave you a list of special materials needed to create a magic mirror to bypass the ward. You collected a Blue Stone, a Rock Piece, a Glossy Crystal, and a Mithril Ornament and took them to Diana in the city of Sanctum. She asked you to wait while she made the mirror.