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The presence of Mnemosyne lives in this piece. It allows you to summon her when you need her. She brings with her the ability to see memories, as she is the Greek goddess of memory. When using this piece you will able to see into the minds of others to see their memories. I could think of several reasons why you would want to do this. First and most important you could see into somebody's memories to acquire their magic/power. This piece also allows you to see memories of places-- for instance all the memories that a house might hold or a particular place such as a cemetery or even the Roman Colisseum.