Multidexterity

(Monster Manual, page 304, DnD 3.5)

[Monster]

You are skilled at utilizing all your hands in combat.

Prerequisite

DEX 15, access to a form with three or more arms

Benefit

You ignore all penalties for using your off hands. (A creature has one primary hand, and all the others are off hands; for example, a four-armed creature has one primary hand and three off hands.)

Special

This feat isthe same as the Ambidexterity feat for creatures with three or more arms.

Normal

Without this feat, a creature suffers a -4 penalty on attack rolls, ability checks, and skill checks made with an offhand.