Child of Null

Magic Resistance. The Child of Null has advantage against spells and other magical effects.

Stealth. While in dim light or darkness, the Child of Null can take the Hide action as a bonus action.

Turning Immunity. The Child of Null is immune to features that turn undead.

Regeneration. The Child of Null regains 10 hit points at the start of its turn. If Child of Null takes radiant damage, this trait doesn’t function at the start of its next turn. The Child of Null’s body is destroyed only if it starts its turn with 0 hit points and doesn’t regenerate.

Unusual Nature. The Child of Null doesn't require air, food, drink, or sleep. 

Multiattack. The Child of Null makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 3 (1d6) necrotic damage.

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Necrotic Breath (Recharge 5–6). The dragon exhales shadowy dark smog in a 30-foot cone. Each creature in that area must make a DC 19 Dexterity saving throw, taking 56 (16d6) necrotic damage on a failed save, or half as much damage on a successful one. A humanoid reduced to 0 hit points by this damage dies, and rises as a zombie. It acts immediately after the dragon in the initiative count. The zombie is under the dragon’s control.