As two actions, you create two magical motes in your space. They float in the air and orbit you for the duration. When you cast the spell—and once on on each of your turns thereafter as an action—you can expend a mote, sending it streaking toward a point within 20 meters. Once a mote reaches its destination or impacts against a solid surface, the mote explodes. Each creature within 1 meter of that point takes 2d8 + your spellcasting ability force damage.
If you have four or more motes remaining, they shed bright light in a 5-meter radius and dim light for an additional 5 meters. If you have one to three motes remaining, they shed dim light in a 5-meter radius.
You can increase the number of motes by 2, the damage by 1d8 for each additional mana expended, and the damage by 1d8 for every two additional mana expended.