Undead Fortitude. If damage reduces the zombie heavy armorer to 0 hit points, it must make a Constitution saving throw with a DC of 3 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 10 hit points instead.

Heavy Armor Master. All bludgeoning, piercing, and slashing damage that the zombie heavy armorer takes from nonmagical attacks is reduced by 4.

Unimpeded Movement. The zombie heavy armorer treats difficult terrain as normal terrain.

Multiattack. The zombie heavy armorer can use its taunt ability. It then makes one weapon attack.

Longsword. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit 13 (2d8 + 5) slashing damage.

Spear. Melee/Ranged Weapon Attack: +8 to hit, reach 5ft., range 30/60 ft., one target. Hit 11 (2d6 + 5) piercing damage.

Shield Slam (defensive stance only). Melee Weapon Attack: +8 to hit, reach 5ft., one target. Hit 8 (1d6 + 5) bludgeoning damage. The target must succeed on DC 16 Constitution saving throw or be stunned until the end of their next turn and be knocked back 5 feet if they are a medium or smaller creature.

Taunt (recharge 5-6). The zombie heavy armorer its sword against its shield and releases a battle cry. All creatures within 30 feet of the zombie heavy armorer must succeed on a DC 15 wisdom saving throw or receive disadvantage on all attacks that aren't against the zombie heavy armorer. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Defensive Stance. The zombie heavy armorer enters a stance that gives it a +5 to AC but gives it disadvantage on all weapon attacks except its Shield Slam and decreases its movement speed by 10 feet. The zombie heavy armorer can use a bonus action to leave its defensive stance.

Block. When a creature makes a successful melee or ranged attack roll against the zombie heavy armorer, it can give itself +3 to its AC, potentially turning a hit into a miss, until the beginning of its next turn.