Clockwork Serpent
Huge • Construct • Unaligned
Armor Class 16
Hit Points 95 (10d12 + 30)
Speed 30 ft., climb 30 ft.
Initiative +1 (11)
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 20 (+5) | 12 (+1) | 16 (+3) | 3 (-4) | 12 (+1) | 5 (-3) |
Damage Immunities poison, psychic
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses blindsight 30 ft., passive Perception 11
Languages understands creator’s languages but can’t speak
CR 6 (XP 2,300; PB +3)
Acid Susceptibility. When the serpent takes acid damage, its speed is halved until the end of its next turn.
Magnetic Climb. The serpent can climb difficult surfaces, including along ceilings, without needing to make an ability check, provided the surface is made out of metal.
Unusual Nature. The serpent doesn't require air, food, drink, or sleep.
ACTIONS
Multiattack. The serpent makes one Bite attack and uses Constrict. It can replace the Bite attack with a use of Metal Net or Poison Mist.
Bite. Melee Weapon Attack: +8, reach 10 ft. Hit: 21 (3d10 + 5) piercing damage.
Constrict. Strength Saving Throw: DC 16, one Large or smaller creature the serpent can see within 10 feet. Failure: 23 (4d8 + 5) bludgeoning damage, and the target is grappled (escape DC 16). While grappled, the target is restrained.
Poison Mist (1/Day). The area in a 20-foot emanation originating from the serpent, spreading around corners, becomes heavily obscured for 1 minute or until a strong wind (such as one created by gust of wind) disperses it. While inside the area, any breathing creature is poisoned.
Metal Net (3/Day). Dexterity Saving Throw: DC 14, one creature within 60 feet that the serpent can see. Failure: The target becomes restrained until the net is destroyed (AC 17; HP 15; immunity to poison and psychic damage).
BONUS ACTIONS
Magnetic Pull. Strength Saving Throw: DC 14, one creature made out of metal, wearing metal armor, or being restrained by the serpent’s Metal Net within 60 feet. Failure: The target is pulled 15 feet towards the serpent.
Clockwork Serpent
Huge • Construct • Unaligned
Armor Class 15
Hit Points 51 (6d12 + 12)
Speed 30 ft., climb 30 ft.
Initiative +1 (11)
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 18 (+4) | 12 (+1) | 14 (+2) | 3 (-4) | 12 (+1) | 5 (-3) |
Damage Immunities poison, psychic
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses blindsight 30 ft., passive Perception 11
Languages understands creator’s languages but can’t speak
CR 3 (XP 700; PB +2)
Acid Susceptibility. When the serpent takes acid damage, its speed is halved until the end of its next turn.
Magnetic Climb. The serpent can climb difficult surfaces, including along ceilings, without needing to make an ability check, provided the surface is made out of metal.
Unusual Nature. The serpent doesn't require air, food, drink, or sleep.
ACTIONS
Multiattack. The serpent makes one Bite attack and uses Constrict. It can replace the Bite attack with a use of Metal Net or Poison Mist.
Bite. Melee Weapon Attack: +6, reach 10 ft. Hit: 13 (2d8 + 4) piercing damage.
Constrict. Strength Saving Throw: DC 16, one Large or smaller creature the serpent can see within 10 feet. Failure: 14 (3d6 + 4) bludgeoning damage, and the target is grappled (escape DC 14). While grappled, the target is restrained.
Poison Mist (1/Day). The area in a 20-foot emanation originating from the serpent, spreading around corners, becomes heavily obscured for 1 minute or until a strong wind (such as one created by gust of wind) disperses it. While inside the area, any breathing creature is poisoned.
Metal Net (2/Day). Dexterity Saving Throw: DC 12, one creature within 30 feet that the serpent can see. Failure: The target becomes restrained until the net is destroyed (AC 17; HP 10; immunity to poison and psychic damage).
BONUS ACTIONS
Magnetic Pull. Strength Saving Throw: DC 12, one creature made out of metal, wearing metal armor, or being restrained by the serpent’s Metal Net within 30 feet. Failure: The target is pulled 10 feet towards the serpent.
Clockwork Serpent
Huge • Construct • Unaligned
Armor Class 17
Hit Points 126 (12d12 + 48)
Speed 30 ft., climb 30 ft.
Initiative +1 (11)
| STR | DEX | CON | INT | WIS | CHA |
|---|---|---|---|---|---|
| 22 (+6) | 12 (+1) | 18 (+4) | 3 (-4) | 12 (+1) | 5 (-3) |
Damage Immunities poison, psychic
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses blindsight 30 ft., passive Perception 11
Languages understands creator’s languages but can’t speak
CR 9 (XP 5,000; PB +4)
Acid Susceptibility. When the serpent takes acid damage, its speed is halved until the end of its next turn.
Magnetic Climb. The serpent can climb difficult surfaces, including along ceilings, without needing to make an ability check, provided the surface is made out of metal.
Unusual Nature. The serpent doesn't require air, food, drink, or sleep.
ACTIONS
Multiattack. The serpent makes one Bite attack and uses Constrict. It can replace the Bite attack with a use of Metal Net or Poison Mist.
Bite. Melee Weapon Attack: +10, reach 10 ft. Hit: 32 (4d12 + 6) piercing damage.
Constrict. Strength Saving Throw: DC 18, one Large or smaller creature the serpent can see within 10 feet. Failure: 27 (5d8 + 6) bludgeoning damage, and the target is grappled (escape DC 18). While grappled, the target is restrained.
Poison Mist (1/Day). The area in a 30-foot emanation originating from the serpent, spreading around corners, becomes heavily obscured for 1 minute or until a strong wind (such as one created by gust of wind) disperses it. While inside the area, any breathing creature is poisoned.
Metal Net (3/Day). Dexterity Saving Throw: DC 16, one creature within 90 feet that the serpent can see. Failure: The target becomes restrained until the net is destroyed (AC 17; HP 20; immunity to poison and psychic damage).
BONUS ACTIONS
Magnetic Pull. Strength Saving Throw: DC 16, one creature made out of metal, wearing metal armor, or being restrained by the serpent’s Metal Net within 60 feet. Failure: The target is pulled 20 feet towards the serpent.
QUICK REFERENCE
USING MONSTER VARIANTS
Monster variants allow the GM to adjust encounters to better match the party’s strength, narrative needs, or world-building logic. A weaker variant may represent a juvenile, wounded, or lesser specimen, while a stronger variant can serve as a leader, champion, ancient creature, or apex predator.
Variants can be used to fine-tune difficulty without changing the core identity of the monster, making them ideal for scaling encounters, reinforcing hierarchy within a faction, or creating memorable boss-style enemies. You can even use the same stat block but different variants in the same encounter if you want.
Design Note. Each monster is primarily balanced around its normal version. Weaker and stronger variants are derived adjustments and may not always preserve every tactical nuance or “feel” of the original creature. GMs are encouraged to review variants carefully and adjust abilities or tactics as needed to best suit their table.