Thrór's Key
The Hobbit: On the Doorstep#16 (x3)

Attach to a hero.

Response: After a location is added to the staging area, attach Thrór's Key to that location. While attached to a location, Thrór's Key gains: "Treat attached location's printed text box as blank, except for traits."

"The key that went with the map! Try it now while there is still time!" –Bilbo, The Hobbit