You can choke foes with a lasso.
Benefit(s): When you successfully entangle a creature with a lasso and beat the target’s CMD by 5 or more, the target cannot speak above a whisper and must succeed at a concentration check (DC = 20 + your CMB + the spell level) to cast a spell with a verbal component, use a command word item, or use any magic requiring speech. Additionally, the DC of an Escape Artist check to slip free of a lasso you are using equals 15 or your CMD, whichever is higher.
Pathfinder Roleplaying Game Monster Codex © 2014, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, Logan Bonner, Jason Bulmahn, Ross Byers, John Compton, Robert N. Emerson, Jonathan H. Keith, Dale C. McCoy, Jr., Mark Moreland, Tom Phillips, Stephen Radney-MacFarland, Sean K Reynolds, Thomas M. Reid, Patrick Renie, Mark Seifter, Tork Shaw, Neil Spicer, Owen K.C. Stephens, and Russ Taylor.