Undead Rage. Undead Dragonborn Barbarian is under constant rage. It has resistance to bludgeoning, piercing and slashing damage, and deals extra damage on melee attacks.

Special Equipment. Undead Dragonborn Barbarian has with it a Blue Chromatic Rose, giving it resistance to lightning damage. Also it uses a +1 Greataxe.

Multiattack. Undead Dragonborn Barbarian makes two greataxe attacks. It can use Draconic Deathbreath in place of one of the attacks.

Greataxe. Melee Weapon Attack: +10 to hit, reach 5 ft., # target. Hit: 16 (1d12 + 9) slashing damage. 

Draconic Deathbreath. (Recharge 4-6) Exhalation of magical energy in a 30-foot line that is 5 feet wide. Each creature in that area must make a DC 15 Dexterity saving throw. On a failed save, the creature takes 4d10 necrotic damage. On a successful save, it takes half as much damage.

Reckless strike. Undead Dragonborn Barbarian can us its bonus action to gain advantage on next weapon attack. If it does so, until the start of Barbarian's next turn all attacks against it are made with advantage.

Necrotic Retribution. When Undead Dragonborn Barbarian is hit with melee attack, it can use reaction to cause 2d6 necrotic damage to the target that attacked it.