A perfectly white, plain opera mask with no eye holes. When worn, it puts the wearer into a deep sleep and causes their mind to go into a dream state, from which they cannot escape without concerted effort, but as the dreamworld is so pleasant, concerted effort is unlikely. Once the dream world has been escaped, the mask breaks and the wearer awakes. There are about one hundred of these items, but it is unknown who owns them. They have been traded on black markets, both magical and non, for centuries. Extremely valuable, they cannot be used lightly.