Constructs in the Monster Manual: Golems, Modrons, and Animated Objects
The construct type in Dungeons & Dragons covers one of the game's most mechanically distinctive categories: creatures that are built, not born. Golems, modrons, animated objects, and their kin operate under rules that differ sharply from biological monsters, and understanding those differences changes how Dungeon Masters deploy them and how players survive them. This page covers the defining traits of constructs, how their stat blocks work, the major subcategories, and the judgment calls that arise when constructs meet edge cases at the table.
Definition and Scope
A construct, as defined in the fifth edition Monster Manual, is a creature category encompassing manufactured beings animated by magic, divine will, or mechanical artifice. The category includes 4 major classic golems (clay, flesh, iron, stone), the modron hierarchy (5 base types: monodrone through pentadrone, plus the rarer higher modrons), and animated objects of varying sizes from flying swords to rugs of smothering.
What ties these creatures together at the rules level is a shared immunity package. Constructs are immune to poison and psychic damage, immune to the poisoned and exhaustion conditions, and — critically — immune to effects that require a living physiology to function: charm, fright, paralysis from spells that specifically target biological creatures. They don't need to breathe, eat, or sleep. A stone golem standing at the bottom of a river for 40 years is equally functional at year one and year forty.
For a broader view of how monster types structure the game's ecology, the complete overview of monster types and subtypes breaks down how construct sits alongside aberration, undead, and the other 12 categories.
How It Works
The construct's stat block follows standard Monster Manual formatting, but several entries deserve specific attention.
Hit Points and Damage Immunities
Construct HP pools trend large. The iron golem, with a challenge rating of 16, carries 210 hit points (20d10+100 by the stat block's formula). It's immune to fire, poison, and psychic damage, and to bludgeoning, piercing, and slashing from nonmagical, non-adamantine weapons. That last detail — the weapon material qualifier — is what makes iron golems genuinely threatening at high levels even in parties bristling with magic items.
Condition Immunities
The immunity to charm and fright is mechanically significant. Spells like dominate monster and fear simply fail against most constructs. A Dungeon Master running construct-heavy encounters needs to telegraph this early; players who burn a 9th-level slot on psychic scream against a clay golem will rightly feel cheated if they weren't warned by prior lore or skill checks.
Modrons: A Special Case
Modrons introduce a construct variant rooted in Mechanus, the plane of absolute law. They have Intelligence scores (a monodrone's is 4, a pentadrone's is 10), they can communicate, and they operate under the Great Modron March — a documented planar event that cycles roughly every 289 years according to established D&D cosmology. This makes them dramatically different from golems, which have Intelligence scores of 3 (clay, flesh, stone) or 6 (iron) and follow only the simplest spoken commands.
Common Scenarios
Constructs appear in three recurring encounter frameworks:
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Guardian encounters — A golem stationed in a dungeon to protect a specific location or object. These are the classic construct deployment: the wizard's sanctum guarded by a flesh golem, the dwarven vault sealed behind an iron golem that attacks anything not carrying a specific key-item aura. The creature doesn't pursue beyond its assigned area, which creates tactical geometry players can exploit.
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Controlled construct encounters — A spellcaster directing an animated object or lesser golem mid-combat. Here the construct acts as a force multiplier, and the smart play is targeting the controller before the construct. The animated objects section of the Monster Manual lists 6 stat block variants by size (tiny through huge), each with different AC and attack profiles.
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Runaway or berserk golems — Stone and flesh golems have a berserk mechanic: when damaged below a threshold HP, they may lose control and attack randomly. This transforms a tactical encounter into a chaotic emergency, and it's one of the more narratively compelling moments the construct category offers.
Decision Boundaries
The questions that actually slow down play at the table cluster around a few recurring lines.
Does a construct count as a creature for spell targeting?
Yes — constructs are creatures under fifth edition rules, even if they're not living in a biological sense. Spells that target "a creature you can see" affect constructs normally unless those spells specifically require a living target (such as spells that reference the poisoned condition, which constructs resist).
Golems vs. animated objects: what's the functional difference?
Golems have creator-independent persistence — once animated, they don't require ongoing magical maintenance. Animated objects, by contrast, are typically sustained by an active spell (the animate objects spell has a duration of 1 minute, concentration). This distinction matters enormously for worldbuilding: a golem guarding a tomb for centuries is plausible lore; a rug of smothering independently guarding a rug shop for decades is not.
Can constructs be healed?
Not by standard healing spells, which restore HP to living creatures. The mending spell repairs constructs for 1d8+4 HP in some table rulings, though fifth edition's core rules don't explicitly confirm this universally. The foundational overview at the site index links to additional rulings discussions, and the conceptual framework for how game mechanics operate provides context for how these edge cases are typically adjudicated.
Constructs reward Dungeon Masters who understand them mechanically. A golem that's deployed correctly — immune profile exploited, berserk threshold as a tension mechanic, lore established before the encounter — hits very differently than one that just stands in a room and swings.