Stormcloud 2014

You create a 20-foot radius cylinder of crackling storms, up to 100 feet high, centered on a point you choose within range. At the start of each of your turns, you can choose to move the cylinder up to 10 feet in a direction of your choice. The cylinder spreads around corners, and its area is difficult terrain. The area is lightly obscured, and creatures inside are deafened.

As a bonus action on each of your turns, you can direct a lightning strike from the cylinder at one creature of your choice within 60 feet of the center. Make a ranged spell attack, with advantage on the attack roll if the target is within the cylinder. On a hit, the target takes 2d12 lightning damage.

After this lightning strike, each creature in the area must make a Constitution saving throw. A creature takes 4d8 thunder damage on a failure, or half as much damage on a success.

When you cast this spell using a spell slot of 5th level or higher, the thunder damage increases by 1d8 and the lightning damage increases by 1d12 for every two slot levels above 4th.