Bug's Buzzsaw

You hurl a 12-inch-diameter toriodal vortex of force blades at a creature that you can see within range. Make a ranged spell attack against the target. If the attack hits, the creature takes 6d10 force damage. 100 gp worth of diamond dust is consumed from the little sword each time the spell is cast. It may be used 5 times before you have to add more dust.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 2d10 for each slot level above 6th.