It appears like a golden compass branded with the Styne Family's coat of arms. When opened, a certain lock locked the pointer position. If unlocked, the pointer will point to the direction of the Book of the Damned, where ever it is. However, if the book contained and saved in a Men of Letters's Curse Box, it cannot be used to detect it anymore.
- The compass design shared similar design like the The Golden Compass. The Golden Compass is a 2007 British-American fantasy-adventure film based on Northern Lights, the first novel in Philip Pullman's trilogy His Dark Materials.