Off-hand

Your off-hand can wield another weapon if you want to fight simultaneously with two weapons, a shield to protect yourself, or can help you wield two-handed weapon.

Note that unless you invest in the two-weapon fighting line of feats, you will suffer a -6 to-hit penalty with your main hand and a -10 with your off-hand when dual-wielding. These penalties are lessened to -4/-6 if the weapon in your off-hand is a light weapon.