Swarm of Nuts and Bolts

Swarming nuts and bolts, and other tiny pieces of scrap metal fill a 20-foot-radius sphere centered on a point you choose within range. The sphere spreads around corners. The sphere remains for the duration, and its area is lightly obscured. The sphere's area is difficult terrain.

When the swarm first appears, each creature in the area must make a Constitution saving throw. A creature takes 4d10 bludgeoning damage on a failed save, or half as much damage on a successful one. After this initial effect, a creature must make the saving throw when it enters the spell's area for the first time on a turn or ends its turn there. The damage dealt by this spell is considered magical for the purpose of overcoming damage resistance to bludgeoning damage.

On each of your turns after you cast this spell, you can use an action to move the swarm up to 30 feet in any direction.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d10 for each slot level above 5th.