mental shield

Exploration Stage: Hall of Weddings
From: Professor
Description: After examining the items found so far, I noticed that the thing on top of the metal frame seems to be missing. It could be something to reflect the psychic energy. If that's the case... maybe a mirror? Can you help me find it?
Completed: This reflector fits perfectly with the frame I found earlier! I've done some experimenting, and I'm pretty sure it's used to repel werewolf psychic powers. But it doesn't seem to be effective against more than one werewolf at a time.