Here's what I came up with. I did, however, also like Stalker0's suggestion.
Power Attack
Prerequisite: Str 15
Benefit: You can draw on your strength and inner reserves of power to recklessly attack your foes with extra might. You gain use power attack as an at-will power.
Power Attack Feat PowerYou attack your enemies with extra force, leaving yourself open to attack.
At-Will ✦ Stance
Minor Action Personal
Effect: While you are in this stance, you gain a +2 bonus to melee damage rolls (or a +3 bonus to the damage roll with a two-handed weapon). This extra damage increases by level, as shown on the table below. In addition, you take a –2 penalty to AC and Reflex defenses. This penalty does not increase at higher levels.
Special: When you exit this stance, you still take the penalty to AC and Reflex defense until the beginning of your next turn.
Level Extra damage (two-handed weapon)
1st-10th +2 (+3)
11th-20th +4 (+6)
21st-30th +6 (+9)
Power Attack
Prerequisite: Str 15
Benefit: You can draw on your strength and inner reserves of power to recklessly attack your foes with extra might. You gain use power attack as an at-will power.
Power Attack Feat PowerYou attack your enemies with extra force, leaving yourself open to attack.
At-Will ✦ Stance
Minor Action Personal
Effect: While you are in this stance, you gain a +2 bonus to melee damage rolls (or a +3 bonus to the damage roll with a two-handed weapon). This extra damage increases by level, as shown on the table below. In addition, you take a –2 penalty to AC and Reflex defenses. This penalty does not increase at higher levels.
Special: When you exit this stance, you still take the penalty to AC and Reflex defense until the beginning of your next turn.
Level Extra damage (two-handed weapon)
1st-10th +2 (+3)
11th-20th +4 (+6)
21st-30th +6 (+9)