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, fire, or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Sun vulnerability. If the zombie is in sunlight, it must make a DC 20 Constitution saving throw. On a failure, it takes 4d4 fire damage and is now on fire. While on fire, it may repeat this saving throw once a turn, after it takes 4d4 fire damage

Stumble. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.

Terrible Moan. If this zombie is attacked, the zombie can let out a wail, attracting all zombies in a 20 ft. radius and causing them to attack the attacker of this zombie.