Ghosts are most intense immediately after death, expending their energy to compel the living to complete some task of theirs left unfinished.
But after a few years, energy exhausted, ghosts fade and are reduced to wisps or phantasms… and then just unusual regions of spooky feelings when people pass through their former haunts.
Professor Bolton says ghosts can replenish their spectral vitality with fear and life force energy drawn from the living, but there are also natural waves in the world that intensify with great disasters.
But digging up someone’s grave works too.
Pass me the shovel.
And step back.