You manifest a bolt of lightning in your hand and hurl it toward a creature of your choice within range. Make a ranged spell attack against the target. On a hit, the target takes 4d6 lightning damage, and the creature must succeed a constitution saving throw or be stunned until the end of your next turn

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.