Double the Attack Speed bonus when using two Axes.

Lucky Hit: Critical Strikes have up to a 55% chance to grant +0.6% increased Attack Speed for 2 seconds. +0.5% increased Critical Strike Chance against Injured enemies.

The following table lists the effects for each weapon class. Upon reaching the maximum Expertise level of 10, a bonus effect is also unlocked. Each weapon class starts at Expertise level 1 and features a unique effect that improves linearly with every Expertise level. The Arsenal System also allows the Barbarian to grow more experienced with the different weapon classes as they are used in combat. It should be noted that by default, the Barbarian is able to equip four weapons at once: A Two-Handed Bludgeoning (Mace), a Two-Handed Slashing (Axe, Polearm, or Sword), and a Dual-Wielded set (One-Handed Axe, Mace, or Sword). This causes the Barbarian to automatically swap to the appropriate weapon upon casting the skill to which it is assigned. The primary unique class mechanic of the Barbarian is the Arsenal System, which allows the Barbarian to assign specific weapons to specific skills. Unique Barbarian Class Mechanic – Arsenal System

Icyveins diablo 3 barbarian builds