Door Bauble

The Door Bauble is a small iron orb the size of an apple. It is attuned to inter-planar portals. It becomes warm with an inter-planar door is within 30 feet of it. In addition, if the user knows the true name of a specific inter-planar portal, the Door Bauble can be made to glow distinctly on its surface, pointing in the direction of a specific portal.