You distill your channeled energy into your weapon to empower it.
Benefit: A swift action, you can expend one use of channel energy to grant your weapon attacks a bonus on damage rolls equal to twice the number of dice rolled for your channel energy. This additional damage is of an energy type determined by your domain or blessing: acid (Earth), cold (Water), electricity (Air), or fire (Fire). If you have more than one of those domains or blessings, you must choose one of those damage types when you use this ability. This effect lasts for your next three weapon attacks or until the end of combat, whichever comes first.
Pathfinder Roleplaying Game: Advanced Class Guide © 2014, Paizo Inc.; Authors: Dennis Baker, Ross Byers, Jesse Benner, Savannah Broadway, Jason Bulmahn, Jim Groves, Tim Hitchcock, Tracy Hurley, Jonathan H. Keith, Will McCardell, Dale C. McCoy, Jr., Tom Phillips, Stephen Radney-MacFarland, Thomas M. Reid, Sean K Reynolds, Tork Shaw, Owen K.C. Stephens, and Russ Taylor.