Cerek's Wondrous Warriors

This spell creates 5 invisible, mindless, shapeless entities of force that come to your aid. They keep a perimeter around you to a distance of 10 feet for the duration.

When you cast this spell, you can designate any number of creatures you can see to be unaffected by it. An affected creature's speed is halved in the area, and when the creature enters the area for the first time on a turn or starts its turn there, it must make a Constitution saving throw, as the warriors begin to assault them. On a failed save, the creature takes 1d6 force damage for each warrior still active. On a successful save, the creature takes half as much damage.

As a bonus action on each of your turns for the duration of the spell, you can send out one of the warriors in a reckless assault to a point you can see within 30 feet. The warrior travels to the point, and then detonates in brilliant fashion. Each creature within a 10 foot cube centered on the point must make a Constitution saving throw, taking 3d8 force damage on a failure, or half as much on a success. The warrior is then lost for the duration of the spell.

Once you run out of warriors, the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8, and increases by an additional 1d8 at 6th and 8th level.