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Source: Monster Manual

Description: You can fight with multiple weapons

Prerequisites: DEX 13, Three or more hands

Penalties for fighting with multiple weapons are reduced by 2 with the primary hand and reduced by 6 with off hands.

Normal

A creature without this feat takes a –6 penalty on attacks made with its primary hand and a –10 penalty on attacks made with its off hands. (It has one primary hand, and all the others are off hands.) See Two-Weapon Fighting.

Special

This feat replaces the Two-Weapon Fighting feat for creatures with more than two arms.