Vastayan Flames

You call upon the power within you and release it in the form of a firey explosion centered around you. Every creature within 15 ft of you (other than yourself) must make a dexterity saving throw or take 4d6 fire damage (Half on a successful throw).

Flammable objects that aren't equipped within that radius catch on fire.

Creatures who failed the saving throw will take 1d4 fire damage from a burn at the start of their next two turns.

At higher Levels: For every spellslot-Level above third you use to cast this spell, add 1d6 to the damage roll.