Divine Reverence

The caster calls upon the power of the moon, smiting their foe with the wrath of Selûne.
On hit, the target takes 3d6 radiant damage. The turn they are hit, it are made to make a Wisdom Saving throw, or else become frightened. Followers of Selûne have advantage on these saving throws. 
At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for every other slot level above 2nd.