Blue Dragon Soul

Due to the unique souls of Dragonborn, they are able to cultivate the focus of their souls into dangerous fighting forces. For blue Dragonborn, they strive to embody the speed and deadliness of a strike of lightning.

Lightning Step

Beginning when you choose this archetype at 3rd level, as an action you can charge your body with lightning and move up to three times your movement speed in a straight unobstructed line. This movement does not provoke opportunity attack. Any creature you pass must make a Dexterity saving throw (DC 8 + proficiency bonus + dexterity modifier) taking 2d6 lightning damage on a failed save or no damage on a successful save. This ability can be used once per short rest. 

Damage increases by 1d6 at levels 7, 10, 15, 18, and 20.

Empowered Breath Weapon

Starting at 7th level, you can empower your breath weapon with the force of your soul. This increases the damage to 8d6 and the range to a 60 by 5 line. This Ability can be used a number of times equal to your proficiency bonus and resets on a long rest but must recharge on 5-6 on a d6 before another use.

The damage increases by 2d6 at levels 10, 15, 18, and 20.

Sparkstep

At 10th level, you gain 10 feet of movement speed.

Reflex Arc

Starting at 15th level, twice per short rest you can add your proficiency bonus to any Dexterity saving throw or ability check.

Charged

At 18th level, any creature that hits you with- or that you hit with a melee attack takes 6d4 lightning damage. 

This increases to 6d8 at level 20.