Brawling Warrior [Multiclass Fighter]

Heroic Tier
Prerequisite: Str 13 or Wis 13
Benefit: You gain training in one skill from the fighter’s class skills list.
Once per encounter while you wield a weapon in one hand and have nothing in your other hand, you can use a free action during your turn to gain a +1 bonus to an attack roll you just made or a +1 bonus to AC until the start of your next turn.

Published in Martial Power 2, page(s) 146.