Barbarian's of the Path of the Tempest are the classic, dual wielding vikings of old.  The tempest is the point of calm within a whirling barrier of deadly blades. Poets use colorful terms such as dancer to describe the movement of a tempest and her two blades, but mastery of this fighting style is not about dancing. Nor is it about impressing anyone - least of all poets. The tempest focuses on learning the ultimate secrets of two-weapon fighting for a single purpose—the destruction of her enemies.

Typically hardy individualists, tempests rarely learn their skills through any sort of formal training. Instead,they master their art though constant application of its disciplines and experimentation on their foes. Similarly,no matter how famous tempests become, it’s rare for them to take on students. Their art, they say, is one that can be learned but never taught.

Tempest Fighting Style

Starting at 3rd level, you gain the Tempest fighting style.  When wielding two weapons, you may wield any one handed martial weapon in your main hand, and any one handed simple weapon in your off hand.  All other restrictions on two weapon fighting still apply.

Windswept Rage

Starting at 3rd level, when you rage, you add your strength modifier and rage bonus to the extra attack from two weapon fighting.  In addition, opportunity attacks against you from moving have disadvantage.

Gale Stance

Starting at sixth level, when you have a weapon in each hand, you add half your proficiency bonus (rounded down) to your armor class.

Whirlwind

At 10th level, as an action, you may make a melee attack against each creature in your reach.    In addition, each successful hit adds an additional die of damage (die is based on the one handed weapon used in your main hand). At 16th level, this increases to two (2) additional dice.

Howling Strikes

Starting at 10 the level, all weapon attacks you make while you are raging deal +1d6 thunder damage. 

Fierce Gale

At 14th level, when you are raging, you make two attacks with your off hand weapon as a bonus action.