Vault Guardian Golem

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Large Construct, Lawful Neutral

Armor Class 20 (natural armor)

Hit Points 210 (20d10+100)

Speed 30 ft.

STR 26 (+8)

DEX 9 (-1)

CON 21 (+5)

INT 1 (-5)

WIS 1 (-5)

CHA 1 (-5)

Saving Throws Con +9

Skills Stealth +4

Damage Vulnerabilities fire

Damage Resistances bludgeoning; piercing; slashing from nonmagical attacks

Damage Immunities poison, psychic

Condition Immunities charmed, frightened, paralyzed, petrified, poisoned

Senses darkvision 60 ft., passive Perception 10

Languages understands Common and Primordial but cannot speak

Challenge 10 (5,900 XP) Proficiency Bonus +4

Antimagic Susceptibility. The golem is incapacitated while in the area of an antimagic field.

Legendary Resistance (3/Day). If the golem fails a saving throw, it can choose to succeed instead.

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

Actions

Multiattack. The golem makes two slam attacks.

Slam. Melee weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 28 (4d10+6) bludgeoning damage.

Guardian's Shield. The golem raises its arm to create a protective barrier. Until the start of its next turn, it gains +2 AC and imposes disadvantage on attack rolls made against it.

Iron Rain (Recharge 5-6). The golem releases a shower of molten iron in a 30-foot radius around it. Creatures in this area must make a DC 18 Dexterity saving throw, taking 45 (10d8) fire damage on a failed save, or half as much on a successful one.

Reactions

Shield of Steel. When a creature that the golem can see makes an attack against an ally within 10 feet, it can impose disadvantage on that attack.

Legendary Actions

The Vault Guardian Golem can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The golem regains spent legendary actions at the start of its turn.

Detect. The golem makes a Wisdom (Perception) check.

Slam Attack. The golem makes a slam attack.

Iron Rain (Costs 2 Actions). The golem uses its Iron Rain ability.

Environment Urban, Underdark

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Lore & Description

Appearance

This towering figure is constructed from massive plates of rusted iron, adorned with ancient glyphs that pulse faintly. Its eyes glow red, giving it a fearsome presence. The surface is rough and battered, hinting at years of guarding its sacred domain.

Behavior & Origins

The Vault Guardian Golem was created centuries ago by a forgotten civilization to guard their most prized treasures. It lacks intelligence but is fiercely dedicated to its task. Unyielding and relentless, it attacks intruders with powerful slams and shields itself with a protective barrier.

Monster Image

Generation Info

Original prompt:
"An iron golem guardian of an ancient vault"

Created: Jan 28, 2026
Modified: May 31, 2026