Vengeful Saint

You create six tiny bolts of holy light shaped like shields with a sharp bottom in your space. They float in the air behind you for the spell’s duration. When you cast the spell — and as a bonus action on each of your turns thereafter — you can expend one or two of the bolts, sending them streaking toward the creature that dealt the damage. Once a bolt reaches its destination against the creature, the bolt goes into the chest of the creature.  The bolt then forces the creature to make a constitution saving throw. A creature takes 4d6 radiant  damage on a failed save, or half as much damage on a successful one. The bolts evaporate in a burst of holy light once the damager is killed. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the number of bolts created increases by two, and the damage increases by 2d6 for each slot level above 3rd