Improved Power Attack
From DDO wiki
Improved Power Attack: Your Power Attack feat does 1/2/3 additional point of bonus damage but also has an additional -1/-2/-3 to your attack bonus.
|AP Cost: 1||Ranks: 3||Progression: 10||Requires: Power Attack|
Not to be confused with Improved Power Attack from the Legendary Dreadnought Epic Destiny, which increases your damage by 0.5[W].