Divine Retributionist (5e Feat)
From D&D Wiki
Prerequisites: At least 1 level in either Cleric or Paladin
With your divine powers, you bring retribution upon evil doers and alike.
Whenever a creature is dealt radiant damage by you, you may have it make a Charisma saving throw. The DC for this saving throw equals your cleric or paladin spell save DC. On a failed save, that creature cannot use its action on its next turn. On a successful save, nothing happens.