Concentrated Music

A glorious purple streak of light, along with the song you play, flashes from your readied instrument to a point you choose within range and then blossoms with a low roar into an explosion of flame. Each creature in a 100-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 3d20 fire damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell, the damage increases by a total of 5 for each dice, for each character level above 9th.