Storm Front
3rd level evocation (Druid, Wizard, Storm)
Casting Time: 1 action
Range: 90 feet
Components: V, S, M (a piece of damp coal)
Duration: Concentration, up to 1 minute
You create a storm front filled with lightning and thunder on a solid surface within range. Select up to 4 connected 5-foot-by-5-foot 10-foot high cubes that create the storm front. The wall doesn't block line of sight, and creatures and objects can pass through it. It emits bright light out to 10 feet and dim light for an additional 20 feet. When the storm front appears, each creature within its area must make a Dexterity saving throw. On a failed save, a creature takes 3d4 lightning damage and the same amount of thunder damage (use the first roll for both damage types), or half as much damage on a successful save. A creature takes the same damage when it enters the wall for the first time on a turn or ends its turn there.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d4 for each slot level above 4th.