The hand mirror is a quest item used in the Mourning's End Part II quest. It is obtained by pulling a lever in the Temple of Light near the start of the quest and is needed to solve the light puzzle in the Temple. As the player progresses through the puzzle they are rewarded with more mirrors in order to unlock more complicated parts of the puzzle. The mirrors redirect light to the place it needs to go if you put it at the right angle. This item is not bankable and if you try you will get a message saying "a magical force prevents you from banking this item"