Light Cavalry

Infantry Slayer. While mounted, the dragonborn has advantage on melee weapon attacks against creatures that are Medium or smaller and are not mounted.

Mounted Warrior. While mounted, the dragonborn's mount can't be charmed or frightened.

Cavalry Saber. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) slashing damage.

Shortbow. Ranged Weapon Attack: +3 to hit, range 80/320 ft., one target. Hit: 4 (1d6 + 1) piercing damage.

Fire Breath (Recharges after a Short or Long Rest). The dragonborn breathes fire in a 15-foot cone. All creatures in that area must make a DC 12 Dexterity saving throw, taking 10 (3d6) fire damage on a failed save, or half as much damage on a successful one.