The Live Plan of What Lies Beneath is a Magykal map of all the Ice Tunnels that ran bellow the castle except from the section that traveled to the Isles of Syren and the House of Foryx. It is kept inside of the Manuscriptorium Vaults.
The map is capable of showing, within reason, a true-to-life display of what is currently occurring in the Ice Tunnels. When an object or being of reasonable size is present in the tunnels, a small shadow shows on the map. While this is not enough information to determine who it is, it is generally enough for the reader to distinguish between a ghost, wraith, living person, etc.
The map also only displays at a certain depth. Objects/beings above or below a certain point do not show on the map.