The greased slide has a veritable nest of sharp blades and razor wire at its bottom, as well as an obvious abjuration effect.  Standing behind the blades are six ghouls, staring at the bottom of the ramp.  A bit of gore on the assorted sharp metal, and the looks of anticipation on the faces of the ghouls, suggest that someone has already been torn to bits and eaten by a ghoul here.<br/><br/>(make a DC 10 hide check to stay hidden from the ghouls)