Power stance

◯ Power Stance (at-will standard action ✦ stance maneuver)
Prerequisites:	heavy blade, polearm, or blunt weapon fighting style
Effect:	You may shift one pace when you enter this stance. Until the stance ends, you suffer a -1 penalty to melee weapon attacks, but gain a stance bonus to melee weapon damage equal to your Constitution modifier for all two-handed melee weapon attacks. You may end this stance as a free interrupt when you would hit with a melee attack to suffer a -4 penalty to that attack roll, but add 4 + your Constitution modifier to damage.