Greater Multiweapon Fighting
( Savage Species, p. 35)[Monster]
A creature with three or more arms can fight with a weapon in each hand. The creature can make up to three attacks per round with each extra weapon.
Prerequisite
Improved Multiweapon Fighting (SS) , Multiweapon Fighting (MM) , DEX 19, Base attack bonus +15, Multidexterity, three arms,
Benefit
You may make up to three attacks with each offhand weapon that you wield, albeit with a -10 penalty on the third attack with each such weapon.
Special
This feat replaces the Greater Two-Weapon Fighting feat (originally presented in Masters of the Wild) for creatures with more than two arms.