Momentomori

A rare and expensive drug, produced by a spider-like bot that, when released, clamps itself on the forehead of a corpse and injects its nanite payload into the brain. Within 15-20 minutes, a teardrop black shape begins to form from an orifice in the bot. It condenses into an almond-sized jewel. When allowed to dissolve on the tongue, the jewel delivers a vivid experience of the departed's last minutes of life (no more than half an hour, depending on how long it's been since their death. Bodies dead longer than 24 hours yield only fragments, if anything).