Your FC/FCs are in a twilight forest at night when a huge black shadow pases over them, they look up as it pases again this time hoovers over them but when they look up there is nothing there....then they hear an eccoing growling/hiss - sounding laugh

a huge black shadow pases over them, they look up as it pases again this time hoovers over them but when they look up there is nothing there....then they hear an eccoing growling/hiss - sounding laugh.

then your character/s fall for an illusion of their worst nightmare come true...