You can make a trip attack with a quarterstaff on all adjacent enemies.
Prerequisites: Int 13, Combat Expertise, Improved Trip, Tripping Staff, Weapon Focus (quarterstaff ), Weapon Specialization (quarterstaff ), base attack bonus +12.
Benefit: As a full-round action, while wielding a quarterstaff two-handed, you can attempt a trip combat maneuver against each enemy adjacent to you.
Special: If you are a magus with the staff magus archetype, you can use spellstrike on any one trip combat maneuver you make with the staff.
Section 15: Copyright Notice – Ultimate Magic
Pathfinder Roleplaying Game Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.