Medium construct, lawful evil

Armor Class 15 (natural armor)
Hit Points 135 (18d8 + 54)
Speed 30 ft.

14 (+2) 12 (+1) 17 (+3) 12 (+1) 14 (+2) 15 (+2)

Saving Throws Str +5, Wis +5
Damage Resistances acid, cold, fire, lightning
Damage Immunities necrotic, poison, psychic
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses darkvision 60 ft., passive Perception 12
Languages the languages it knew in life
Challenge 5 (1,800 XP)
Proficiency Bonus +3


  • Construct Nature. The fellforged doesn’t require air, food, drink, or sleep.
  • Inhabiting Spirit. The fellforged is inhabited and animated by a specter. If the fellforged fails a saving throw against an effect that turns undead, the specter is expelled into an unoccupied space within 5 feet of the fellforged with the hp total it had before it was expelled. The specter otherwise uses the statistics of a specter. Without its animating specter, the fellforged becomes dormant for 1 minute then crumbles to pieces and is destroyed. The expelled specter can reinhabit the dormant fellforged as a bonus action while within 5 feet of the fellforged, making it active again and using the specter’s current hp as the fellforged’s hp total.
  • Sunlight Sensitivity. While in sunlight, the fellforged has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.


  • Multiattack. The fellforged makes two Necrotic Slam attacks.
  • Necrotic Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage plus 9 (2d8) necrotic damage. If the target is a creature, it must succeed on a DC 14 Constitution saving throw or its hp maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hp maximum to 0.


  • Burst Gears. The specter within the fellforged strains the construct’s body, sending broken springs and gears flying. Each creature within 5 feet of the fellforged must make a DC 14 Dexterity saving throw, taking 7 (2d6) piercing damage on a failed save, or half as much damage on a successful one. Each time the fellforged uses this bonus action, its speed is reduced by 5 feet, and it can’t use this bonus action if its speed is 0. Its speed returns to normal when it finishes a long rest.


A darkly foreboding intelligence glows behind this automaton’s eyes, and its joints seep hissing green vapors.

Spectral Constructs. Fellforged are the castoffs of gearforged and clockworks production, given foul sentience when the construct bodies attract specters yearning to feel the corporeal world. The clockwork bodies trap the specters, but it gives them physical form. The specters twist the bodies to their own use, sometimes going so far as to destroy the body to harm the living. On rare occasions, other ghostly undead choose to inhabit such constructs, using the constructs as tools to enact their will in the living world at the cost of many of their natural abilities and defenses.

Soldiers for Vampires. Fellforged often seek out greater undead as their masters. Vampires and liches are favorite leaders, but mummies and darakhul also make suitable commanders.

Grave Speech. The fellforged’s voice is echoing and sepulchral, unnerving most living creatures.

Section 15: Copyright Notice

Tome of Beasts 1 ©2023 Open Design LLC; Authors: Daniel Kahn, Jeff Lee, and Mike Welham.

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