Multidexterity

(Monster Manual II, page 18, DnD 3.5)

[Monster]

The creature is adept at using all its hands in combat.

Prerequisite

DEX 15, Three or more arms

Benefit

The creature ignores all penalties for using an off hand.

Special

This feat replaces the Ambidexterity feat for creatures with more than two arms.

Normal

Without this feat, a creature using an off hand takes a -4 penalty on attack rolls, ability checks, and skill checks. 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.