As of Patch This information is reliable as of patch 2.0.206.26.
Multiweapon Mastery
Skill Tree

Multiweapon Fighting

Prerequisite Skills

Multiweapon Expertise

Cost

200 sp

Requirements

27 Agility, 27 Strength

ID

Multiweapon_Mastery

Your chance to strike with each of your offhand weapons is increased by 50%.

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Factions that can teach Multiweapon Mastery

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Creatures That Have Multiweapon Mastery