
leem |

I am assuming he is talking about as an Attack of Opportunity, and I would have to say he has it wrong. You can't do a power attack as an AoO. You must decide you are going to do it at the START of your turn, and it lasts a full round till your next turn. It's bonuses and penalties then affect all your attacks and combat maneuvers.
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...You must choose to use this feat before making an attack roll, and its effects last until your next turn. The bonus damage does not apply to touch attacks or effects that do not deal hit point damage.

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I am assuming he is talking about as an Attack of Opportunity, and I would have to say he has it wrong. You can't do a power attack as an AoO. You must decide you are going to do it at the START of your turn, and it lasts a full round till your next turn. It's bonuses and penalties then affect all your attacks and combat maneuvers.
PRD wrote: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...You must choose to use this feat before making an attack roll, and its effects last until your next turn. The bonus damage does not apply to touch attacks or effects that do not deal hit point damage.
Your words don't match the text you quoted.
You said you have to declare it at the start of your turn - the feat doesn't say that.
You said it has to last a whole round - the feat only says until your next turn. (That will normally be 1 round, but that's not what the feat requires.)

Nicos |
Yes, attack penalties (power attacking, fighting defensively, lunging, etc) apply to combat maneuvers. Likewise, applicable bonuses (flanking, attacking invisibly, higher ground, True Strike, and so on) apply.
(CRB pg 199, under "Performing a Combat Maneuver")
You are mostly correct, but just for the record lunge do not have penalty to the attack.