Twin Sword Style( Player's Guide to Faerûn, p. 46)
You have mastered a defensive style based on wielding a blade in each hand.
Elf (Menzoberranyr or Waterdeep), half-elf (Waterdeep), or human (Sembia or Waterdeep), profi cient with martial weapons,
When fighting with two blades (dagger, longsword, rapier, scimitar, or short sword, in any combination), you can designate a melee opponent during your action and receive a +2 shield bonus to your Armor Class against attacks from that opponent. This bonus stacks with the shield bonus from a buckler or animated shield. You can select a new melee opponent as a free action on your turn. You lose this bonus if you are caught flat-footed or lose your Dexterity bonus to AC for any reason.
You may select this feat only as a 1st-level character. You may have only one regional feat.