Freezing rain

You point to a location within range, from the cloud or the ceiling a heavy rain of ice and sleet falls down making visibility heavily obscured and making the ground slick with ice particles.
Any creature moving within the area for the first time in and out of their turn, must make a Reflex save against your WIS. save CL..
On a failure, they slip and fall Prone.
When the spell ends the ice remains until it thaws in 1 D4 hours (unless your GM rules otherwise).