Eye Spy Arrowhead
“An unsettling, shifting eye rests at the base of this arrowhead, just before the shaft of the arrow. Purples and blues swirl in its iris, giving the occasional wink with its metallic eyelid.”
When this ammunition hits any surface that is not a creature, it becomes embedded into said surface, and can only be removed by a DC 18 Strength check. After being lodged into a surface, the rest of the arrow or bolt shatters, leaving only the arrowhead.
For the next 8 hours, the creature that shot the ammunition can close its eyes, and use its own stats to make Perception check to see whatever the arrowhead’s eyeball sees. When the creature opens its eyes, the arrowhead’s eye closes, and the arrowhead becomes invisible. After the 8 hours end, the arrowhead shatters into several small pieces of iron and glass.