Swift Blade Style is an arena fighting style feat. It is available to martial classes, and requires Two-Weapon Fighting (with Dexterity 13). [Dr368:62]
The feat works best with light blades.
It modifies two powers:
- Dual strike (Fighter): If both attacks hit and you are wielding a light blade in each hand, you gain a +2 feat bonus to attack rolls and damage rolls with opportunity attacks until the start of your next turn.
- Twin Strike (Ranger): If both attacks hit and you are wielding a light blade in each hand, you deal extra damage equal to your Dexterity modifier to one of your targets.