Reference: Dual Wielding

[Vutall]

Off-hand Weapons & Multiple Attacks
Many players are interested in having their characters use two weapons simultaneously. This is not particularly common in Rokugan, as the vast majority of bushi use the katana, which is traditionally wielded in both hands. Exceptions exist, notably with the Dragon Clan and their daisho technique, the Mantis and their tendency to use matched pairs of small weapons, and the Lion’s favoring of the katana and war fan combination.

A character’s handedness is determined by the player.

A character attempting to make an attack with a weapon in his off-hand suffers a penalty of -5 to the roll if it is a small weapon, -10 if it is medium, and -15 if it is large. Additionally, attacks made with the character’s dominant hand suffer a penalty of -5 to attacks as long as a secondary weapon is held in the off hand. NOTE: Unless you are Rank 3 and have Simple Action Attacks, you cannot attack with both your main hand and off hand weapon in the same turn, as an attack is a Complex action.

However, a character wielding two weapons is more difficult to hit due to the larger area covered. As a result, characters wielding two weapons add their Insight Rank to their Armor TN.