You conjure a swarm of insects manifesting as a heavily obscured 5-foot cube within range that you direct where to fly. When you cast this spell, and on subsequent turns, you can direct the swarm to move up 20 feet.

Whenever the cube moves into the space of a creature you can see and whenever a creature you can see enters the cube or ends its turn there, it must make a Constitution saving throw, taking 7 (3d4) piercing damage on a failure, or half as much on a success. A creature can be affected by this spell only once per turn.

Using a Higher-Level Spell Slot. The speed increases by 5 feet, and the damage increases by 1d4 for each spell slot level above 2.