Cecil's Shocking Step

You crackle with energy as you step through the weave to attain the best position for an attack. Electricity surrounds you and you teleport to a spot behind an enemy within 100 ft. of you. You then make a melee spell attack roll to deal 4D6 lightning damage. Due to the power rushing through the creature on a successful hit, they also take one level of exhaustion if they fail a constitution saving throw. 

For every spell level above fourth you deal 2D6 extra and can teleport 40 feet further.