Two Weapon

You get a third attack with your off-hand weapon, albeit at a -10 penalty.

A fighter may select Greater Two-Weapon Fighting as one of his fighter bonus feats.

An 11th-level ranger who has chosen the two-weapon combat style is treated as having Greater Two-Weapon Fighting, even if he does not have the prerequisites for it, but only when he is wearing light or no armor.

In addition to the standard single extra attack you get with an off-hand weapon, you get a second attack with it, albeit at a -5 penalty.

Without this feat, you can only get a single extra attack with an off-hand weapon.

A fighter may select Improved Two-Weapon Fighting as one of his fighter bonus feats.

A 6th-level ranger who has chosen the two-weapon combat style is treated as having Improved Two-Weapon Fighting, even if he does not have the prerequisites for it, but only when he is wearing light or no armor.

When wielding a double weapon or two weapons (not including natural weapons or unarmed strikes), you gain a +1 shield bonus to your AC.

When you are fighting defensively or using the total defense action, this shield bonus increases to +2.

A fighter may select Two-Weapon Defense as one of his fighter bonus feats.

Your penalties on attack rolls for fighting with two weapons are reduced. The penalty for your primary hand lessens by 2 and the one for your off hand lessens by 6.

If you wield a second weapon in your off hand, you can get one extra attack per round with that weapon. When fighting in this way you suffer a -6 penalty with your regular attack or attacks with your primary hand and a -10 penalty to the attack with your off hand. If your off-hand weapon is light the penalties are reduced by 2 each. (An unarmed strike is always considered light.)

A 2nd-level ranger who has chosen the two-weapon combat style is treated as having Two-Weapon Fighting, even if he does not have the prerequisite for it, but only when he is wearing light or no armor.

A fighter may select Two-Weapon Fighting as one of his fighter bonus feats.