Limbbound Ballista

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Large Monstrosity (living weapon), Chaotic Evil

Armor Class 16 (natural armor)

Hit Points 119 (14d8+56)

Speed 30 ft.

STR 18 (+4)

DEX 12 (+1)

CON 18 (+4)

INT 6 (-2)

WIS 12 (+1)

CHA 6 (-2)

Saving Throws Con +8

Skills Stealth +2, Perception +5

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 9 (5,000 XP) Proficiency Bonus +4

Limb Regrowth. The Limbbound Ballista regrows severed limbs at the start of its turn, up to a maximum of 4 limbs.

Living Siegecraft. The limbs are its weaponry. A limb it detaches can be hurled as a living projectile. If all limbs are detached, the creature cannot fire until at least one limb regrows.

Siege Mind. This creature is relentless and patient, often studying its targets before striking.

Actions

Multiattack. The Limbbound Ballista makes two Limb Bolt attacks and one Slam attack.

Limb Bolt. Ranged weapon Attack: +7 to hit, range 120 ft., one target. Hit: 13 (2d8+4) piercing damage. The Ballista fires one of its living limbs as a bolt.

Slam. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8+4) bludgeoning damage. The Ballista swings a spare limb like a club, smashing a nearby foe.

Environment Forest, Mountain

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Lore & Description

Appearance

A towering frame of iron and sinew, the Limbbound Ballista resembles a colossal siege engine brought to life. Its chassis is a lattice of plates and sinew, with a carven groove where limbs slide into place like arrows. The limbs themselves are living, pale arms with joints that click as if gears grind. It lumbers forward on thick pistons, aiming its groaning war-pursuit at distant targets, and when it releases a shot, a severed limb is hurled like a bolt toward foes, fusing organic menace and mechanical precision.

Behavior & Origins

Born from a failed war experiment, the Limbbound Ballista is a sentient siege engine that can replace its own limbs at will. It waits in ruined fortresses, watching for intruders and savoring the moment to unleash a volley of living projectiles. It hates soft flesh and loves the scent of iron and oil. Adventurers who seek to stop such creatures must detach the limbs themselves and quickly strike at the torso before the ballista reattaches its weapons.

Monster Image

Generation Info

Original prompt:
"A living ballista that fires its own limbs."

Created: Feb 2, 2026
Modified: May 22, 2026