Exalted Smite

You channel divine wrath from your Deity or Patron at a chosen target.  

You call down a column of radiant energy which strikes the target for 3d8 Radiant damage. The damage increases by 1d8 if the target is a Fiend or Undead.

The target must make a Charisma saving throw.  Upon failure, the target hallucinates, believing the caster to be the living embodiment of the caster's Deity or Patron.  The target grovels, acting as though they are Frightened of the caster.  They must also crawl instead of move normally (same mechanics as Difficult Terrain) until the spell ends.

They can dispel the effect with a successful saving throw or if the caster's concentration is broken.  If the target is hit by the caster with an attack, the effect also ends.  

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each additional spell level.