Torrent Snare

You pile waterlogged plants or access a nearby source of water to rain down on a Medium or smaller creature that enters the snare's square. When a creature enters the square, the snare's square and all adjacent squares become slippery difficult terrain, and the triggering creature must attempt a DC 19 Reflex saving throw, with the following effects.

Success The target is unaffected.

Failure The target falls prone.

Critical Failure The target falls prone and is forced into one of the other squares soaked by the snare.