Venom Blast

You launch a crackling beam of lightning at a target within range. The creature makes a Dexterity saving throw, taking 4d6 Lightning damage and 2d6 Poison damage and is Paralyzed for 1d4 turns on a failed save or half as much on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.