Superior Whirlwind Attack
You strike out at all nearby enemies with both your weapons.
Prerequisites: Dexterity 17, Combat Expertise, Dodge, Mobility, Spring Attack, Whirlwind Attack, Two-Weapon Fighting, Improved Two-Weapon Fighting, Advanced Two-Weapon Fighting, base attack bonus +11.
Benefit: If you are wielding a weapon in each hand, you may use both weapons with Whirlwind Attack. You make one melee attack each with your main-hand and off-hand weapons against each opponent within reach. Your two-weapon fighting penalties still apply.
Normal: Without this feat, you can only make a single melee attack against each opponent when using the Whirlwind Attack feat.
Special: A fighter may select Superior Whirlwind Attack as one of his fighter bonus feats.