reaper's boat, angel of life, Angel of death

a reaper's boat picking up some wandering souls that did not follow their reapers before, and crossing over to the other side.
the boat has the moon as it's source of light, and trails of fog and clouds to hide the boat. 
the boat color is dark so it won't be easily seen on night skies. every night the boat slowly moves across the sky as the moon moves across the sky. 
if the remaining souls never follow the reapers they will eventually become ghosts.