The character excels in wielding one-handed melee weapons that use a die of D6 or less for damage calculation (e.g., 1d6+4, 2d6+1, 3d4+2, etc.). This ability not only allows them to perform a Double Attack without the usual damage penalties on the secondary weapon, but also to use weapons normally designated for the primary hand in their secondary hand.
Evolution
Level 3: The character no longer incurs attack roll penalties when using two weapons that fit this description during a Double Attack.
Level 5: The Double Attack is simplified: the character makes two attack rolls but only keeps the better result for both attacks.
Level 7: The skill now extends to one-handed melee weapons using a D8 as the damage die.