rework by warry101- Potsh the barbarian subclass

Flying through the battlefield the Storm Herald picks apart his enemies bringing them to their knees before they can react. 

Lightning movement

Starting at 3rd level, you may use your action to move anywhere within 60 ft of your current location, though not through walls.

While raging you gain the ability to access the full extent of your inner storm. Now when you use Lightning movement and move through the space of an enemy it takes 1d6 damage. (no save)

As you grow and become more powerful so do your abilities. at level 6 you deal 2d6, at level 10 you deal 3d6 damage, and at level 14 the power can be used as a bonus action. (all while raging)

Conjure Storm

At 6th level, you gain the power to summon a massive rainstorm around your character with a bonus action. The storm extends 200 ft in all directions with your character as the CenterPoint. Due to extreme winds and pouring rain everywhere within the storms berth becomes difficult terrain. This effect does not spread beneath cover (when you're inside), but could feasibly destroy brittle constructs. (DM's discretion). 

At level 12 you may choose for the storm to have a blinding effect in addition to the difficult terrain. The Blindness not only blocks line of sight but also blinds enemies with Blindsight. (this does not extend to Truesight)

While Raging, you become immune to all effects of the Conjure Storm ability.

Thunder Strike

At 10th level, the Spirit of the Storm has seen you and acknowledges your power. once per short rest you gain the ability to coat your weapon in flowing plasma. 

your next attack gains +5 to hit (in addition to active modifiers), It counts as magical for the purposes of bipassing resistances, and it deals an additional 1d12 lightning damage and 1d12 fire damage.

At 14th level the attack deals 2d12 lightning and 2d12 fire damage.

Hurricane

At 14th level, you are no less devastating than a natural disaster. While beneath a storm you may take two actions per turn (conjure storm counts), your movement speed doubles and your Thunderstrike ability lasts an additional action.

While raging, you are enveloped by the sheer power of your inner storm. all abilities that may only be activated with direct access to a storm may now be used anywhere, and you gain resistance Slashing, bludgeoning, fire, thunder, and lightning attacks.