Blood Cartography

The blood always remembers.
You draw blood from the vial or corpse and cast it upon the parchment. The blood flows together, forming a clear map of every location that the former owner of the blood has traveled within the past month. The path the creature took is highlighted, and the time spent in each location is indicated by the thickness of the blood-markings. The blood-map dries within one minute, and becomes permanent and impossible to dispel.