Dragon's Breath - Stoic

You touch one willing creature and channel the carefully controlled elemental energy of your Inner Flame into it, granting the creature the ability to exhale supernatural energy.

Choose Acid, Cold, Fire, Lightning, or Poison when you cast the spell. Until the spell ends, the affected creature can take a Magic action to exhale a 15-foot Cone of the chosen energy.

Each creature in the Cone must make a Dexterity saving throw against your spell save DC, taking 3d4 damage of the chosen type on a failed save or half as much damage on a successful one.

The affected creature can use this breath weapon repeatedly for the duration of the spell.

Stoic Restraint. This spell is restrained by your Stoic State, decreasing the breath weapon's damage dice from d6s to d4s, including every subsequent use during the spell's duration.

When you cast this spell, you can use Red Colour Conversion to change all damage dealt by the breath weapon to Fire damage for the entire casting, regardless of the damage type originally chosen. If you do, every use of the breath weapon deals Fire damage. Your Stoic State improves your Ranger spell save DC, allowing the breath weapon's controlled elemental energy to be more difficult to resist at the cost of raw damage.

Using a Higher-Level Spell Slot. The damage increases by 1d4 for each spell slot level above 2nd.