Blood print

1st-level necromancy (ritual)
Casting Time: 1 action
Range: Touch
Components: V, S, M (an ounce or more of blood)
Duration: Instantaneous
At your touch, wet blood on a surface shifts and reforms into a pattern of crimson blotches. This blood print is unique to the particular creature to whom the blood belongs, but you can determine the creature’s kind (such as human, gnoll, deer, or fire giant) by examining the general shape. A print can be preserved by pressing a sheet of paper against it. If this spell is cast twice, it is possible to match samples of blood originating from the same creature by comparing the prints.