If somebody dies, and his body is not buried in a grave, the skeleton should start spawning ghosts, and if you walk too close to a ghost, you get "spooked"-wound, which would give some stat penalty for some time, and also experience event.
Ghosts would only spawn 1 at time and this event would be relatively rare, ghosts would stay close to the skeleton.
Spooked debuff could posisbly increase agility and strength, but decrease psyche and intelligence.
Destroying a skeleton (not burying) would also spawn a ghost that would remain in the world for some time.