Breath of Iskuljalil

You breathe out a 5-foot by 30-foot line of lightning.

Each creature caught in the line must make a Dexterity saving throw. On a failed save, the creature takes 4d6 lightning damage, or half as much on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the cold damage increases by 1d6 for every slot level above 2nd.