Frozen Lightning Spear

Drawing on draconic energies, you create a massive frozen lightning spear and slam it into the ground, causing lightning to strike in a 15ft wide, 60ft long line. All creatures in the area must make a Dexterity saving throw, taking 4d6 cold damage and 4d6 lightning damage on a fail, or half as much on a success.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, both damages increase by 1d6 for each slot level above 3rd.