Atlas Pyramid

This brass pyramid lined with steel can be opened as a bonus action to reveal a radiant diamond within. While the pyramid is opened, you can say a location aloud. A map of the location is then projected on a nearby flat surface so long as the map is in the prism's memory. You can spend 1 hour to add a map you can see within 5 feet of you to the prism's memory. The diamond within the prism is worth 1000gp. If the diamond is removed, the prism ceases to function until a diamond of equal or greater value is placed inside it.