Wrath of God

A puryfing fire  engulf  a creature that you can see within range. The target must succeed on a Dexterity saving throw or take 1d8 radiant damage. The target gains no benefit from cover for this saving throw. If the target rolls a 1 or 2 on their Dexterity saving throw, the spell deals maximum damage

The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).