You are a warrior with abilities to swiftly end all conflicts. You are able to withstand many trials and as you grow, your electric power with grow along with you. Others will see this and might desire to follow this path. The path of the Arc Spartan is tough. It requires discipline and not many others are like you, but maybe you can change that.

Amped Attack

Beginning when you choose this archetype at 3rd level, your weapon attacks deal an extra 1d4 lightning damage this increases to 1d6 at 11th level and 2d4 at 18th level

Volt Charge

Your connection to lightning strengthens and covers your body. Starting at 7th level, as a bonus action on your turn you can use the dash action, wherever you end your dash creatures within 10 feet of you must make a constitution saving throw or take 1d8 lightning damage and be stunned if they fail and half damage if they pass but aren’t stunned.

You can only use Volt Charge proficiency times a day

Electric Savant

At 10th level, you gain resistance to lightning and thunder damage if you don’t already have it. If you do you gain immunity instead. You also gain advantage whenever you roll for initiative. 

Thunderous Retribution

Starting at 15th level, when a creature attacks you and hits, as a reaction you can cause  your armor to  boom  as if lightning struck. The attacking creature must make a constitution saving throw if it fails it takes 2d8 thunder damage and is deafened. If the creature saves it takes half damage and isn’t deafened. The creature on the end of each of its following turns can reroll the constitution saving throw to try and remove the deafened feature. 

Lightnings herald

At 18th level, you are Lightning’s advocate. You now gain 20 feet of extra movement speed, can ignore the disengage action, and can jump twice as far. You also are immune against stunned or deafened.