Immunity Shuffle. The golem is resistant to all but one type of damage which its vulnerable to. This damage type starts with lightning and changes every 2 rounds in order of lightning, necrotic, acid, force, radiant, psychic, fire, thunder, cold, then poison. It starts over if combat lasts longer than 20 rounds.

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.

Magic Weapons. The golem's weapon attacks are magical.

Siege Monster. The Abjuration Golem deals double damage to objects and structures.

Multiattack. The golem makes two melee attacks or one breath attack and one melee attack.

Slam. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) damage. The damage type is the same type as it is vulnerable to. If the target is a creature, it must succeed on a DC 15 Constitution saving throw or have its hit point maximum reduced by an amount equal to the damage taken. The target dies if this attack reduces its hit point maximum to 0. The reduction lasts until removed by the greater restoration spell or other magic.

Sword. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 22 (3d10 + 6) damage. The damage type is the same type that the golem is vulnerable to.

Poison Breath (Recharge 6). The golem exhales poisonous gas in a 15-foot cone. Each creature in that area must make a DC 16 Constitution saving throw, taking 36 (8d8) poison damage on a failed save and be poisoned for 1 minute, or half as much damage on a successful one and are not poisoned. A creature who is poisoned by this effect can repeat this saving throw at the end of each of their turns ending the effect on a successful save.

Cold Breath (Recharge 5). The golem exhales lightning energy in a 15-foot cone. Each creature in that area must make a DC 16 Constitution saving throw, taking 36 (8d8) cold damage on a failed save and have their speed reduced by 15 feet for 1 minute, or half as much damage on a successful one and their speed is not affected. A creature whose speed is affected by this effect can repeat this saving throw at the end of each of their turns ending the effect on a successful save.