Ward of Lightning

You summon forth lightning from the ground beneath you, creating a ring of lightning that extends in a 5-foot ring around you. For the duration, any creature that tries to enter a 5-foot sphere around you must succeed a Dexterity saving throw DC 12 or take 2d6 lightning damage. On success, they take half as much damage and is unable to try to get closer to you until the start of their next turn.