Droneswarm

A large swarm of drones fill a 10-foot-radius sphere centered on a point you choose within range. The sphere spreads around corners. The sphere remains for the duration, and all ranged attacks going through any space of the sphere have disadvantage. The sphere's area is difficult terrain.

When you cast the spell, you can make a ranged spell attack against a creature within 60 feet of the sphere. This attack has advantage on creatures inside the area instead of disadvantage. On a hit, the target takes 2d6 ballistic damage.

As a bonus action on your turn, you can move the sphere up to 30 feet and repeat the attack against a creature within 60 feet of it.

At Higher Levels. When you cast this spell using a spell slot of 4th or higher, the damage increases by 1d6 for each slot level above 3rd.