Dragon's Sacred Fire

You call upon the power of a dragon and holy fire, sending a beam of radiant fire at a creature you can see within range.

The target must make a Dexterity saving throw or take 3d6 radiant damage and be engulfed in flames that deal an additional 1d6 fire damage at the start of each of their turns until they use an action to extinguish the flames.

If the caster is a Divine Soul Sorcerer, the damage increases to 4d6.

When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.