Legendary Resistance (1/Day). If the dragonborn fails a saving throw, it can choose to succeed instead.
Multiattack. The dragonborn makes two Greataxe attacks.
Greataxe. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit:11 (1d12 + 5) slashing damage plus 13 (3d8) necrotic damage.
Necrotic Breath (Recharge). The dragonborn exhales 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 the dragonborn 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.
Champions of the dragon queen are often called Talons of Tiamat. They work tirelessly to free their master from her imprisonment in Avernus, and Tiamat grants these pawns immense strength and a devastating breath weapon. Champions of Tiamat are sometimes associated with the Cult of the Dragon (described in chapter 3).