The mage can find secret compartments within inanimate matter, discovering hidden doors, safes and vaults.
Extremely well-designed hidden compartments or rooms might levy a – 1 or –2 dice penalty, but usually only the most refined or precise of such misdirectional architecture imposes this penalty.
Mysterium Rote: Mapping the Tomb
With this rote, a Mysterium willworker is capable of detecting the presence of unseen spaces within seemingly solid structures.