At-Will TerrainRope Bridge
This rickety bridge spans a deep gap. One sudden move, and it sways perilously, threatening to put anyone on it over the side.
Requirement: You must be on or adjacent to the bridge.
Check: Athletics check (moderate DC) to sway the bridge.
Success: The bridge sways.
Target: Each creature standing on the bridge (including you, if applicable)
Attack: Level + 3 vs. Reflex
Hit: The target is knocked prone. If the target is already prone, it falls off the bridge.
Published in Dungeon Master's Guide 2, page(s) 63.