Bowgentle's Elemental Barrage

A bright streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of flame. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 fire damage on a failed save, or half as much damage on a successful one.

The caster can activate Bowgentle's enhanced version of this spell by sacrificing some of their magical essence (by expending an additional spell slot) or part of their own life force (the caster sacrifices 1d4 hit points). When the caster does this, the damage is increased by 1d6 and they can change the elemental damage type to one of their choice (except psychic damage).

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.