Grapple. Any target hit by the Slam attack must roll a Strength saving throw, or it gets grappled. While grappled, the target can repeat it saving throw on its turn to try to get free.

Berserk. If damage reduces the construct's hit points to 50%, roll a d6. On a 5 or 6, the construct goes berserk. While berserk, the construct moves at 150% speed. On each of its turns while berserk, the construct attacks the nearest creature, regardless of friend or foe. If there is no creature to move to and attack, it attacks or throws (if throwable) a nearby object. Berserk lasts until the construct is killed or attacked with radiant or smite damage. On a radiant or smite attack, roll a d6. On a 5 or 6 the construct is destroyed, and all zombies are knocked down for one round.

Immutable Form. The golem is immune to any spell or effect that would alter its form.

Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.

Multiattack. The golem makes two slam attacks.

Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.

Throw Object (Berserk). Range Weapon Attack. Throws a nearby object at the target in range. +3 to hit, range 20/60 ft., one target. Hit: 7 (2d4 + 2) bludgeoning damage.