Bone Harvester – weapon of mass destruction

Bone Harvester monster for Dungeons and Dragons

The Bone Harvester is a new monster for Dungeons & Dragons and other fantasy TTRPGs. This undead terror is from our upcoming book Weapons of Mass Destruction, a collection of high level threats for your D&D characters to defeat.

The nightmarish creation of a necromancer, the bone harvester once lumbered across battlefields, collecting the remains of the fallen to produce skeletal warriors for its master. But the evil construct developed a taste for the living, collecting its victims and dissolving their flesh in its gullet.

Bone Harvester

Gargantuan Undead, Neutral Evil

Armor Class 20 (natural armor)

Hit Points 388 (21d20 + 168)

Damage Threshold: 15

Speed 60 ft.

27 (+7)18 (+4)28 (+9)6 (-2)14 (+2)6 (-2)

Saving Throws Dex +10, Con +15, Wis +10

Damage Immunities Necrotic, Psychic

Damage Resistances Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

Condition Immunities Charmed, Exhaustion, Frightened, Incapacitated, Paralyzed, Petrified, Poisoned, Stunned

Senses Truesight 150 ft., Passive Perception 19

Languages none

Challenge 21 (33,000 XP)

Proficiency Bonus +7

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

Magic Resistance. The bone harvester has advantage on saving throws against spells and other magical effects.

Regeneration. The bone harvester regains 20 hit points at the start of its turn if it has at least 1 hit point and at least 1 creature inside it.

Skeleton Horde. The bone harvester is surrounded by 20d6 + 20 Skeletons that are under its control. The skeletons act on the bone harvester’s turn and become inanimate if the bone harvester is destroyed.


Multiattack. The bone harvester makes five Bite attacks.

Bite. Melee Weapon Attack: +15 to hit, reach 30 ft., one target. Hit: 24 (3d10 + 8) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 19 Dexterity saving throw or be swallowed by the bone harvester. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the bone harvester, and it takes 24 (4d6 + 10) acid damage at the start of each of the bone harvester’s turns. A creature that dies inside the bone harvester is regurgitated as a Skeleton under its control.

If the bone harvester takes 50 damage or more on a single turn from a creature inside it, the bone harvester must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the bone harvester. If the bone harvester is destroyed, a swallowed creature is no longer restrained by it and can escape by using 30 feet of movement, exiting prone.

Slam. Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 27 (3d12 + 8) bludgeoning damage. 

Acid Spray (Recharge 5–6). The bone harvester sprays acid in a 90-foot cone. Each creature in that area must make a DC 22 Dexterity saving throw, taking 67 (15d8) acid damage on a failed save, or half as much damage on a successful one.

Legendary Actions

The bone harvester 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 bone harvester regains spent legendary actions at the start of its turn.

Attack. The bone harvester makes one Bite attack.

Charge. The bone harvester moves up to half its speed and makes one Slam attack.

Spew Gore (Costs 3 Actions). The bone harvester regurgitates the liquified flesh of its victims in a 30-foot cone. The area becomes difficult terrain, and each creature standing in the area must succeed on a DC 12 Dexterity saving throw or take 7 (2d6) acid damage and fall prone. A creature that enters the area or ends its turn there must also succeed on a DC 12 Dexterity saving throw or fall prone.

Bone Harvester monster card 1
Bone Harvester monster card 2
Bone Harvester monster card 3
Bone Harvester monster card 4

Destroying the Bone Harvester

Although its bone armor and resistance to nonmagical weapons makes the bone harvester tough on the outside, it is more vulnerable from attacks made by swallowed creatures.

Creatures inside the bone harvester make attacks at disadvantage because they are blinded and restrained, but the bone harvester interior has an AC 14 and no damage threshold.

More D&D Homebrew

Would you like to see more homebrew D&D magic items, monsters, and spells? Follow us on InstagramFacebook, and Twitter and send us your suggestions!

Subscribe to get weekly free homebrew content for Dungeons & Dragons and other tabletop RPGs delivered to your inbox.

Subscribe for More

* indicates required

Leave a Reply

Your email address will not be published. Required fields are marked *