Swarm of Ilmater

You create 30 small circular disks within your space. For the duration of the spell any amount of the disks orbit you or any creature within 60ft of you. Each disk counts as 1 temp hp point, on top of any temp hp you may otherwise have. When you cast the spell — and as a bonus action on each of your turns thereafter — you can expend 5 of the remaining disks to make a ranged spell attack against a target within 60ft, on a hit the target takes 3d4 bludgeoning damage.