Path of the Violent Storm

In ancient days, an era even before The Shattering, there were many tribes that could harness the elements when raging. Most of these tribes lived in areas which lay on faults that lead to other Planes. This was believed to be a lost art but people have been rising up lately with these strange powers from long ago. 

Spark

When reaching 3rd level in this class, You can use your action while raging to Spark yourself. When entering Spark the crackling energy in your body explodes out. All hostile creatures within 10ft of you take lightning damage equal to half of your total Barbarian level rounded down (minimum of 1.) Upon attacking an enemy they take an additional 1d8 lightning damage if the hit is successful. This additional lightning damage increases to 2d8 at level 10 and 3d8 at level 14. When exiting a Sparked Rage you gain a level of exhaustion, as your body needs to recover after being overcharged. 

Energized Muscles

When reaching 6th level in this class your body is used to some of the effects of your Rage. You gain resistance to lightning damage when Sparked. 

Feed the Storm

Upon reaching level 10 in this class, your Sparked rage energizes you beyond normal capabilities. When activating Spark, your movement speed increases by 10ft. When reaching level 14 you gain a +5 bonus to your initiative. 

Tempest

When reaching level 10 in this class, upon reducing a hostile creature to 0 hit points while in a Sparked Rage you emit a burst of lightning in a 10ft area around you. Dealing lightning damage equal to your Barbarian level to all hostile creatures within the burst. If you are not Sparked when knocking the creature to 0 hit points you automatically Spark and burst as normal. You may choose to ignore the automatic Spark but by doing so you do not activate Tempest. 

Thunder Bolt

When reaching level 14 in this class you gain the ability to throw lightning at your enemies. Using your bonus action you hurl a bolt of lighting 10ft out in front of you. The bonus to this attack's range is determined by your strength modifier (minimum of 0). The hostile creature or creatures of your choice must make a Dexterity saving throw of 8 + proficiency bonus + Constitution modifier or take 6d6 + half Barbarian level (rounded down) lightning damage, or half as much on a successful save. Thunder Bolt can only be used a number of times equal to your Constitution modifier (minimum of 1) per long rest. 

Feed the Storm

You gain a +5 bonus to your initiative.