Champion of Tiamat

Necrotic Breath Weapon (Recharge 6). You gain a breath weapon. You exhale shadowy fire in a 30-foot cone. Each creature in that area must make a DC 15 Wisdom saving throw. On a failed save, the creature takes 36 (8d8) necrotic damage and is frightened of you for 1 minute. On a successful save, the creature takes half as much damage and isn’t frightened. A frightened creature can repeat the saving throw at end of each of its turns, ending the effect on itself on a success. If the character using this ability is already a Champion, (Dragonborn of Tiamat) and thus has this ability beforehand, (or has it through some other means) their breath weapon instead becomes maximized and the recharge changes to 5-6. If you are a Dragonborn already, you do gain this breath weapon in addition to your pre-existing breath weapon, and may use either at will, however your natural breath weapon retains its own limitations on use/recharge.