You can make exceptionally deadly melee attacks by sacrificing accuracy for strength. Prerequisites: Str 13, Base Attack Bonus +1. Benefit: You can choose to take a -1 penalty on all melee attack rolls and combat maneuver checks to gain a +2 bonus on all melee damage rolls. This bonus to damage is increased by half (+50%) if you are making an attack with a two-handed weapon, a one handed.. Power Attack (Combat) You can make exceptionally deadly melee attacks by sacrificing accuracy for strength. Prerequisites: Str 13, base attack bonus +1. Benefit: You can choose to take a -1 penalty on all melee attack rolls and combat maneuver checks to gain a +2 bonus on all melee damage rolls. This bonus to damage is increased by half (+50%) if you are making an attack with a two-handed.
Use our free Pathfinder power attack calculator to compute damage bonuses, average damage, and hit probability. Optimize your melee strikes with accurate Power Attack math!. Source Pathfinder Unchained pg. 129 When using this feat, you can spend 2 stamina points to gain the benefits and the hindrances of that feat until the end of your turn, instead of until your next turn. Mythic Power Attack Source Mythic Adventures pg. 71 Your attacks are truly devastating. Prerequisites: Power Attack.