Gray Master

A geist is an ever-shifting mass of black sack cloth, teeth, and mouths, folding in and out of itself and cackling like a thousand frenzied and doomed souls. Created when a haunt kills an evil person, a geist rises from a soul trapped on the plane of their demise, now connected to the dark energy radiating from haunts everywhere. They wander the world, looking for solace and never finding it. In frustration, they turn their malice back onto the living, antagonizing any nearby creatures, hoping to fatally lure their victims into the clutches of a haunt to be turned into another geist and share the torment.

Geists are occasionally mistaken for other incorporeal undead, such as wraiths and ghosts, but their proximity to haunts is one of the surest ways to determine the nature of the undead being encountered.