Zombie Plague Spreader

If damage reduces the zombie to 0 Hit Points, it makes a Constitution saving throw (DC 5 plus the damage taken) unless the damage is Radiant or from a Critical Hit. On a successful save, the zombie drops to 1 Hit Point instead.

Constitution Saving Throw: DC 12, any creature that starts its turn in a 10-foot Emanation originating from the zombie. Failure: The target has the Poisoned condition until the start of its next turn. While Poisoned, the target can't regain Hit Points. Success: The creature is immune to this zombie's Viral Aura for 24 hours.

The zombie makes two Slam attacks.

Melee Attack Roll: +5, reach 5 ft. Hit: 6 (1d6 + 3) Bludgeoning damage plus 9 (2d8) Necrotic damage.

Constitution Saving Throw: DC 12, each creature in a 30-foot Emanation originating from the zombie. Failure: 14 (4d6) Poison damage. Success: Half damage. Failure or Success: If this damage reduces the target to 0 Hit Points, it dies and rises 1 minute later as a Zombie.