Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead

Multiattack. The dragon 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.

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

Breath Weapon (Recharge 5–6).

Breath of the deceased. The dragon exhales a necrotic blast in a 30-foot cone. Each creature in that area must make a DC 16 Constitution saving throw, taking 35 (8d8) necrotic damage on a failed save, or half as much damage on a successful one.