Detect Dragonmark

For the duration, you sense the presence of dragonmarks within 30 feet of you, as well as where the creature is located. Similarly, you know the number of dragonmarks (on creatures or objects) in the area, and the type (abberant, least, lesser, greater or Siberys) of the most potent dragonmark.

The spell can penetrate most barriers, but it is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.