Arrow's Voltaic Desolation

Electricity arcs over you, and infuses you with godly speed. Your speed increases by 180 ft, and you can take an extra action per turn. Your melee weapon attacks deal an extra 14(4d6) lightning damage and you gain immunity to lightning damage.

You can also use your action to unleash your energy as a powerful voltaic outburst. Each creature within 30 ft of you must make a CON save. A creature takes 18(4d8) lightning damage on a failed save, or half as much damage on a successful one. Then roll a d6. on a 1-3, the spell ends.