You have learnt how to siphon positive or negative energy from your channelling ability into spells that cause either heal or harm.
Prerequisite(s): Channel energy class feature
Benefit: As a swift action you can expend a channel energy use to double the effects of any cure wounds spell you cast, if you channel positive energy, or any cause wounds spell you cast if you channel negative energy. This effect applies only to spells you cast this round.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.