Storm dancer

Through a connection to an elemental, a deal with a dragon, a blessing of a god or some secret technique to tap into a certain place in the weeb, you have learned to infuse the power of storms into your fighting style, allowing you to move as quick as the wind and strike with the elemental power of lightning. Making you a fearce opponent in any battle. (High power subclass, nit for every campaign)

Movement of wind

Starting at 3th lvl the wind help you with every step you take, increasing your movement speed by 10ft. 

This bonus increase to 15ft by lvl 10 and 20ft by lvl 15

Lightning strikes

Starting at 3th lvl Electricity surge though you with every strike, you get an additional 1d6 of lightning damage on your sneak attacks. This additional damage increase to 2d6 by level 8 3d6 by 13 and 4d6 at 18

Additionally, you can add your PB in lightning damage to any attacks you make

Lightning step

Starting at 9th lvl you can use your bonus action a number of times equal to your PB bonus, regaining all uses of this feature on a long rest, to briefly turn into lightning, teleporting into a space you can see within 60ft. and leaving behind an intense electrical zap that deal 2d10 lightning damage to every creature within a 5ft line between you and your destination, taking half damage on a successful dexterity saving throw using your class DC (8+PB+DEX). You can use this feature instead of uncanny dodge, taking no damage instead of half, but the damage you deal and the distance traveled is reduced by half.

The damage increase to 3d10 by lvl 13 and 4d10 by lvl 17

favored by storms

Starting at 13th lvl the wind carries you as you please. You gain a flight speed equaled to your land speed as well as resistance to lightning damage

Embodiment of the storm

Starting at 17th lvl you became quick as lightning and swift as wind. Your dexterity score increase by 4 to a maximum of 24