Avenging Flame

You send forth a bolt of holy fire at a hostile enemy. Make a ranged spell attack. On a hit, the target takes 4d8 radiant damage. For 1 minute after being hit, the target must suceed on a Dexterity saving throw at the start of each of its turns or take 2d8 radiant damage. If the target has made an attack during its last turn, it automatically fails this saving throw. While the creature continues to take this damage, the creature sheds bright light in a 20-foot radius and dim light for an additional 20 feet.