Copper Golem — The Rusting Sentinel
At dawn, the bronze doors are covered in a fresh green bloom. At noon, the bells inside begin to ring without being struck. Beside the sealed workshop stands a copper sentinel, motionless except for the gradual turn of its head towards anyone carrying the wrong signet. The master’s family died long ago; the machine still remembers which mark opened the door.
A copper golem is an uncommon guardian forged from heavy copper plates and bound animating power. A smith may have fashioned one to protect a foundry, keep a mine’s sluices operating or carry dangerous magical energy safely between instruments. Some are fierce, talisman-bound forge wardens. Others serve as living batteries that collect hostile sorcery and throw it back as lightning.
Their varied traditions are not interchangeable. The modern rusting sentinel below is a campaign interpretation; the older 3.5e copper guardian uses fire and fears water, while the third-party 2014-compatible one is a smaller, specialised magical capacitor.
The Sentinel That Outlived the Mine
For generations a dwarven copperworker’s hall made gate hinges and warning bells for refugees fleeing the giant successor realms. Its first guardian was ordered to keep the northern sluice closed during an invasion. The gate has been safe to open for centuries, but each keeper who tried to alter the order died before the next inspection. The machine stands by a dry channel while villages downhill now need its water.
Such golems were never intended to be free-thinking citizens. They are workers and guards entrusted with tasks too hazardous or monotonous for a flesh-and-blood watchman. Copper makes a useful magical conduit, but it also carries the visible scars of weather. A statue turning green over decades can conceal a binding that is as exact as when the artisan first sealed it.
What Is Happening Right Now?
The waterwheels of a prosperous market town have stopped. A copper sentinel has shut a highland spillway and refuses to let engineers near the controls. The millers demand the barrier opened before their grain rots. The copper guild claims the machine is protecting the valley from an old poisoning that no one now remembers; the town reeve has promised the workshop’s patent to a rival smith if the guardian is destroyed.
The adventurers can search the maker’s ledger for a forgotten command, recover the talisman stolen during a succession dispute, trace the contamination upstream or divert the channel around the guardian. Killing it would be simpler, except that the dry channel runs beneath the town’s only defensive wall.
Appearance and Behaviour
Some copper golems resemble solemn armour-clad sentries, their faces smooth except for deep copper brows and eyes of polished amber. Others are squat, broad-backed statues with hidden chambers that spark when enchanted tools are brought close. Fresh scratches glow orange before oxidation turns them green. Their steps ring like an anvil struck with a hammer; water splashed against the older fiery patterns may hiss into steam.
A talisman-bound golem follows the signet displayed by its master, even if that person stole the token. A magical-capacitor golem reacts to hostile spells like a dangerous, overfilled vessel. Neither becomes friendly because someone offers it a coin. The sensible approach is to discover which kind stands before the party, and what its maker believed should never be allowed to happen.
Copper Golem Stat Blocks
Select the ruleset your group uses. The 2024 and Pathfinder panels are original conversions. The 3.5e panel retains a community adaptation of an older magazine monster, while the 2014 panel follows a separately published third-party magic-battery creature. Do not combine the different weaknesses, sizes or powers.
Copper Golem — D&D 2024
Original campaign conversion · Large Construct, Unaligned · CR 11 (7,200 XP; PB +4)
AC 18 (copper plating); Initiative +1 (11); HP 189 (18d10 + 90); Speed 30 ft.
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 24 (+7) | 12 (+1) | 20 (+5) | 5 (−3) | 14 (+2) | 9 (−1) |
Saving Throws Con +9, Wis +6; Damage Immunities Poison, Psychic; Condition Immunities Charmed, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned.
Senses Darkvision 60 ft., Passive Perception 12; Languages Understands the languages of the talisman-bearer but can’t speak.
Traits
Immutable Form. The golem cannot shape-shift. Magic Resistance. It has Advantage on saving throws against spells and other magical effects.
Bound to the Talisman. The golem recognises a paired command medallion. The creature displaying it can give the golem one short command as a Bonus Action while within 60 feet. If commands conflict, it follows the most recently authenticated talisman until a maker’s seal supersedes it. Stealing the talisman does not automatically end combat: the golem first completes its current commanded action.
Metal Fatigue. A creature wearing nonmagical metal armour that fails a saving throw against the golem’s Rusting Slam has its armour’s AC reduced by 1, to a maximum reduction of 2. The penalty can be removed by the Mending spell or an hour of work with smith’s tools. Magic armour and nonmetal armour are unaffected. This trait intentionally avoids automatic destruction of equipment.
Actions
Multiattack. The golem makes two Rusting Slam attacks.
Rusting Slam. Melee Attack Roll +11, reach 10 ft., one target. Hit: 20 (2d12 + 7) Bludgeoning plus 10 (3d6) Acid damage. If the target is wearing nonmagical metal armour, it must succeed on a DC 17 Constitution saving throw or suffer Metal Fatigue.
Oxidising Surge (Recharge 5–6). The golem releases a 20-foot cone of biting verdigris. Creatures in the cone make a DC 17 Dexterity saving throw, taking 36 (8d8) Acid damage on failure or half on success. Metal objects that are not worn or carried develop surface corrosion but are not instantly destroyed.
Reaction
Reactive Repair (1/Day). When an attack reduces the golem to half its Hit Points or fewer, it may repair damaged plates and regain 18 (4d8) Hit Points.
Encounter Balance
Two melee hits average 60 damage before resistance. Keep the encounter in a workshop, vault or sluice-house where distance, nonmetal tools, the talisman and maintenance records offer meaningful alternatives to fighting. This is a campaign creature, not an official 2024 SRD monster.
Original campaign conversion built around the existing copper sentinel and the older talisman-bound concept in Polyhedron #30. The rusty-armour mechanic is original.
Copper Golem — D&D 2014
Published third-party 5e creature · Medium Construct, Neutral · CR 7 (2,900 XP)
AC 21 (natural armour); HP 39 (6d8 + 12); Speed 20 ft.
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 19 (+4) | 8 (−1) | 15 (+2) | 8 (−1) | 10 (+0) | 9 (−1) |
Damage Immunities Poison and Bludgeoning, Piercing and Slashing from nonmagical weapons that aren’t adamantine; magical damage is treated separately under Magic Absorption and Magic Immunity. Condition Immunities Charmed, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned.
Senses Darkvision 120 ft.; Passive Perception 10. Languages Understands the language of its owner. Challenge 7 (2,900 XP).
Traits
Magic Absorption. If a magical effect would deal Acid, Cold, Fire, Force, Lightning, Psychic, Radiant or Thunder damage to the golem, that effect is negated for it. Instead add 1 point to its Absorption Pool for each spell level, or 1 point per 10 rolled points of damage when the effect has no spell level. Other magical damage is also ineffective because of Magic Immunity. Record the Absorption Pool between turns.
Regeneration. At the start of its turn, it spends points from its pool to regain 10 HP per point spent, as many as needed up to full HP. It can also spend newly absorbed points immediately to heal damage.
Overload. When the Absorption Pool exceeds 15, the golem explodes, dealing 52 (15d6) Lightning damage in a 50-foot radius. Creatures in range make a DC 16 Dexterity save for half damage. The golem is destroyed.
Indestructible. If reduced to 0 HP with no Absorption Pool points, the golem becomes an inert heap but does not permanently cease to function. A ninth-level dispelling effect applied while inert, a sustained nonmagical furnace capable of melting the body, or Overload permanently destroys it.
Actions
Slam. Melee Weapon Attack +7, reach 5 ft., one target. Hit: 15 (2d10 + 4) Bludgeoning damage.
Lightning Burst. The golem discharges some stored energy down a line 100 feet long and 5 feet wide. Creatures in the line make a DC 15 Dexterity saving throw, taking 1d6 Lightning damage per point currently in the Absorption Pool, or half on a successful save. Reduce the pool by 1d6 points after using this action (minimum 0).
Use at the Table
This is the magical-capacitor Copper Golem, not the Large rusting guardian of the 2024 conversion or the fire-and-water talisman guardian of the older editions. Its 39 HP appears fragile, but its extraordinary magical immunity and Overload can drastically change an encounter. Warn observant characters with brightening arcs and glowing conductive seams before the pool reaches its threshold.
Third-party version: Copper Golem, 5th Edition SRD community/third-party database. Not an official Wizards of the Coast SRD monster. See that publisher’s page for its applicable licensing and authorship information.
Copper Golem — Pathfinder 1e
Original Pathfinder 1e adaptation of the community 3.5e version · CR 8 (XP 4,800) · N Large Construct
Initiative +4; Senses Darkvision 60 ft., low-light vision; Perception +14.
Defence
AC 23 (touch 9, flat-footed 23; −1 size, +14 natural); HP 79 (9d10 + 30); Fortitude +3, Reflex +3, Will +6; DR 5/adamantine; immune to Construct traits and most spells (see below); Weakness Water Vulnerability.
Offence
Speed 20 ft.; Melee two slams +14 (2d8 + 5 plus 1d6 Fire); Space/Reach 10 ft./10 ft.; Special Attacks Fiery Aura.
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 20 (+5) | 11 (+0) | — | 5 (−3) | 16 (+3) | 9 (−1) |
Base Attack +9; CMB +15; CMD 25; Feats Alertness, Cleave, Improved Initiative, Power Attack, Weapon Focus (slam). Environment any; Organisation solitary; Treasure none.
Special Abilities
Fiery Aura (Su). A creature that starts its turn within 10 feet must attempt a DC 14 Fortitude save or take 1d4 Fire damage.
Immunity to Magic (Su). Spells and spell-like abilities allowing spell resistance usually have no effect. A magical Cold effect slows it for three rounds; magical Fire ends the slow effect and heals 1 HP for every 3 Fire damage that would have been dealt; a spell with the Water descriptor instead deals 1d6 damage per spell level.
Water Vulnerability (Ex). Immersion destroys the golem after five continuous rounds. Each of the first four rounds it loses one-fifth of the Hit Points it had at the beginning of immersion. Removing it from the water interrupts the process.
Talisman-Bound (Su). The golem obeys the bearer of its paired engraved talisman, which must be displayed when issuing verbal commands. The bearer can summon it across the same plane; arrival depends on ordinary movement and travel, not teleportation.
Construction — Campaign Conversion
The body is worked from about 1,750 lb. of copper, with 10,000 gp of special preparations. Suggested CL 14th; Price 40,000 gp; Cost 25,000 gp, with a Craft (armoursmithing or weaponsmithing) DC 20 check, Craft Construct, animate objects, flame strike, resist energy and a binding ritual for the talisman. These are proposed Pathfinder rules, not a Paizo Bestiary entry.
This is a campaign adaptation of the community D&D 3.5e talisman-bound Copper Golem, not an official Pathfinder creature. Use the separate Pathfinder numbers in this panel, including its full Construct base attack.
Copper Golem — D&D 3.5e
Community D&D 3.5e conversion · CR 8 · Large Construct · Neutral
Hit Dice 9d10 + 30 (79 HP); Initiative +0; Speed 20 ft. (4 squares).
AC 23 (−1 size, +14 natural); Touch 9; Flat-footed 23. DR 5/adamantine; immune to Construct traits and most magic; Darkvision 60 ft.; low-light vision.
Base Attack/Grapple +6/+15; Attack Slam +11 melee (2d8 + 5 plus 1d6 Fire); Full Attack two slams +11 melee; Space/Reach 10 ft./10 ft.
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 20 (+5) | 11 (+0) | — | 5 (−3) | 16 (+3) | 9 (−1) |
Saves Fort +3, Ref +3, Will +6; Skills Listen +11, Spot +11; Feats Alertness, Cleave, Power Attack, Weapon Focus (slam). Environment any; Organisation solitary; Treasure none; Alignment always neutral.
Special Abilities
Fiery Aura (Su). Creatures within 10 feet make a DC 14 Fortitude save each round or take 1d4 Fire damage.
Immunity to Magic (Su). Spells or spell-like abilities allowing spell resistance normally fail. Magical Cold slows it for three rounds without a save. Magical Fire ends any slowing and heals 1 HP per 3 points of Fire damage it would have dealt; surplus healing becomes temporary HP. Spells with the Water descriptor cause 1d6 damage per spell level.
Water Vulnerability (Ex). Continuous immersion deals one-fifth of its current HP each round; the golem is destroyed on the fifth round of immersion.
Talisman Recognition (Su). At creation the golem is paired with a command talisman. Its bearer can call it from anywhere on the same plane and can give verbal commands while visibly displaying the talisman. It is capable of simple manual labour but remains bound to the instructions given.
Construction
The inherited community version calls for 5,000 lb. of pure copper and magical preparation valued at 10,000 gp, Craft (armoursmithing or weaponsmithing) DC 14, caster level 14th, Craft Construct, animate objects, bless or curse, commune, flame strike, and resist energy. Price 40,000 gp; Cost 25,000 gp + 1,600 XP. Its listed 5,000-lb. construction weight differs from the descriptive 1,750-lb. weight; ask the GM which figure applies to a particular specimen.
This non-SRD community 3.5e conversion was attributed in the earlier entry to Shade of the EN World forums and traced to Jeffrey A. Martin’s earlier copper golem idea in Polyhedron #30 (1986). The 3.5e numbers are not claimed to be an official Wizards of the Coast Monster Manual block.
Running the Copper Golem
Foreshadow its danger. An iron tool left near the 2024 sentinel acquires a green bloom, while armour scraped against its hands needs smith’s care. The fire-bound version makes standing within arm’s reach dangerous and can be forced away from a narrow passage by water. The magical-battery version flickers with increasing brightness as spells feed it, giving players a chance to change tactics before an overload.
Make its literal instructions part of the encounter. A character with a borrowed signet might order it to step aside, but an older makers’ mark could overrule them. Someone who knows the sluice gates can break line of sight without being caught in the workshop. A smith can repair a broken valve, a careful scholar can translate the foundry ledger, and an engineer can route water where a company of soldiers could not force the door.
Three Encounters
The Green Bell of the Mine
A bell rings from a copper mine sealed since the giant wars. The golem beneath it has started striking its own alarm signal whenever a stranger enters the valley, prompting the descendants of two rival clans to assemble for war. The original alarm specified a threat to the western tunnel, not the road above. Rewriting its command requires the old foundry mark now mounted on a noble’s ceremonial mace. The players must decide whether to steal that relic or convince its owner to reopen the mine.
Smoke in the Counting House
The copperworkers’ guild receives letters demanding that an old debt be paid in gold rather than copper. The golem that guards their mint has begun stamping every foreign coin it sees into blank disks, following a wording change on its command plate. The master die, proof of the alteration, lies in a locked furnace room. Carrying it out will activate the guardian. Destroying it could ruin an entire season’s wages; returning the genuine plate might expose a respected magistrate.
The Reservoir Below the Fortress
A fortress above a merchant road has just discovered why its spring ran dry. A copper sentinel has held an ancient sluice closed to contain polluted runoff from an abandoned laboratory. Opening the gate saves hundreds from thirst but releases the poison. The adventurers can mend the treatment works, find a new water source, or hold the guardian off while a healer tests the stored reservoir. If they break the machine, the old lock may fail permanently.
Rewards and Aftermath
A surviving command medallion, a copperworker’s stamp, a treated alloy recipe, diagrams of a defunct waterwheel or an annotated golem manual can outlast the monster. Repairing the sentinel leaves its future use in somebody’s hands. Destroying it may protect the current owner while leaving the next generation without an irreplaceable working guardian.
Related Creatures, Magic and Materials
See the Golem family, Clockwork Golem, Iron Golem, Stone Golem, Oak Golem, Rusting Grasp, Craft Construct and adamantine.
Rules provenance: Jeffrey A. Martin, “Beware the New Golems,” Polyhedron #30 (1986), original copper golem concept; Shade of the EN World forums, attributed community 3.5e conversion; third-party Copper Golem for 5e. All fifth-edition 2024 and Pathfinder statistics labelled campaign conversion are original for this entry. None of the non-SRD versions should be mistaken for a Wizards of the Coast or Paizo core monster.
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