Ghostly Mob

When a horrific tragedy results in mass death, the restless spirits of the numerous dead might arise as a ghostly mob. Like other ghosts, ghostly mobs are often unaware they're dead. The spirits trapped within the mob can try to carry out a semblance of their former lives, even though their memories are fragmentary and their forms are insubstantial. This fragmented memory revolves around their last moments in that location, which compels the ghosts to instinctually play out these last moments, sometimes ranging from a few minutes to entire days' worth of time. When one or more of the members of a ghostly mob are forced to confront their undead nature, the spirits lash out in pain and violence.

Tethered to the world after death by powerful emotions that haven't been resolved, ghosts haunt the living as sad echoes of their former selves. Rules for creating a ghost start on page 160 of Monster Core.