Even in the midst of fierce and furious blows, you can find focus in the carnage and your seemingly wild blows strike home.
Benefit: When you are wielding a two-handed weapon or a one-handed weapon with two hands, and using the Power Attack feat, you do not suffer Power Attack’s penalty on melee attack rolls on the first attack you make each turn. You still suffer the penalty on any additional attacks, including attacks of opportunity.
Advanced Player’s Guide. Copyright 2010, Paizo Publishing, LLC; Author: Jason Bulmahn.