3e SRD:Multiweapon Fighting
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Multiweapon Fighting [General]
Prerequisite: Three or more hands.
Benefit: Penalties for fighting with multiple weapons are reduced by 2.
Normal: A creature without this feat suffers a -6 penalty to attacks made with its primary hand and a -10 penalty to attacks made with its off hands. (It has one primary hand, and all the others are off hands.) See Attacking with Two Weapons, page 124 in the Players Handbook.
Special: This feat replaces the Two-Weapon Fighting feat for creatures with more than two arms. The Multidexterity feat further reduces penalties for off-hand attacks.