Zombie Plague Spreader

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.

The zombie doesn't require air, food, drink, or sleep.

Any creature that starts its turn within 10 feet of the plague spreader must make a DC 12 Constitution saving throw. On a failed save, the creature is Poisoned and can't regain hit points until the end of its next turn. On a successful save, the creature is immune to this plague spreader's Viral Aura for 24 hours.

The plague spreader makes two Slam attacks.

Melee Weapon Attack +5 to hit, reach 5 ft., one target. 6 (1d6 + 3) Bludgeoning damage plus 9 (2d8) Necrotic damage.

The plague spreader releases toxic gas in a 30-foot-radius sphere centered on itself. Each creature in that area must make a DC 12 Constitution saving throw, taking 14 (4d6) Poison 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 (see its stat block in the Monster Manual) 1 minute later. The zombie acts immediately after the plague spreader in the initiative count.