Cyclone Warrior [Multiclass Fighter]

Heroic Tier
Prerequisite: Str 13 or Dex 13
Benefit: You gain training in one skill from the fighter’s class skills list.
Once per encounter as a free action during your turn, while you are wearing light armor or chainmail and wielding a weapon in each hand, you can gain a +1 bonus to damage rolls with melee or close attacks until the end of your turn. This bonus increases to +2 at 11th level and +3 at 21st level.

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