Dungeons and Dragon Ball (Ver. O.1.2)

You create ki blasts, ki blasts appears centered on a target. When you miss a target or a creature succeeds on a saving throw that reduces the damage of one of your ki blasts, you can use your reaction to transform the throated ki blasts into glowing motes of force that float in unoccupied spaces of your choice around your target. A contributing spell creates a number of motes equal to 1 + its spell level. These motes shed dim light in a 10-foot radius, If the spell ends, they disappear. Each mote, raises the potential damage of this spell by 1d6, up to a maximum of 12d6 force damage. As an action, you can command all motes to converge on a single point within the sphere and erupt into a devastating explosion. Every creature within 20 feet of that point must make a Constitution saving throw. They take the accumulated damage of the spell on a failed save, or half as much damage on a success.