5e SRD:Iron Golem
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Large construct, unaligned
Damage Immunities fire, poison, psychic; bludgeoning, piercing, and slashing from nonmagical attacks not made with adamantine weapons
Fire Absorption. Whenever the golem is subjected to fire damage, it takes no damage and instead regains a number of hit points equal to the fire damage dealt.
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.
Multiattack. The golem makes two melee attacks.
Slam. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 20 (3d8 + 7) bludgeoning damage.
Sword. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 23 (3d10 + 7) slashing damage.
Poison Breath (Recharge 6). The golem exhales poisonous gas in a 15-foot cone. Each creature in that area must make a DC 19 Constitution saving throw, taking 45 (10d8) poison damage on a failed save, or half as much damage on a successful one.
The mightiest of the golems, the iron golem is a massive, towering giant wrought of heavy metal. An iron golem's shape can be worked into any form, though most are fashioned to look like giant suits of armor. Its fist can destroy creatures with a single blow, and its clanging steps shake the earth beneath its feet. Iron golems wield enormous blades to extend their reach, and all can belch clouds of deadly poison.