Monster Clockwork Clockwork Leviathan

Source Bestiary 3 pg. 1
Orginally posted in Archives of Nethys
Clockwork Whale by zmoores on DeviantArt
Clockwork Whale by zmoores on DeviantArt

Long and metallic, this serpentine construction resembles a mechanical eel with several paddle-like limbs.

Clockwork Leviathan CR 12
N Huge construct (clockwork)Init +8; Senses Darkvision 60 ft., Low-Light Vision; Perception +0
AC 28, touch 14, flat-footed 22 (+4 Dexterity, +2 dodge, +14 natural, -2 size)hp 128 (16d10+40)

Fort +5, Ref +11, Will +5

DR 10/adamantine; Immune fire, construct traits

Weaknesses vulnerable to electricity

Speed 30 ft., swim 60 ft.

Melee bite +25 (2d6+11), 2 slam +25 (1d8+11 plus grab)

Space 15 ft., Reach 15 ft.

Special Attacks breath weapon (60-ft. line, 12d8 fire damage, DC 18 for half, usable every 1d4 rounds, 3/day), grind, swallow whole (2d8+16 slashing damage plus 2d6 fire damage, AC 17, 20 hp)

Strength 33, Dexterity 18, Constitution -, Intelligence -, Wisdom 11, Charisma 1

Base Atk +16; CMB +29 (+33 grapple); CMD 45 (can’t be tripped)

Feats Improved InitiativeB, Lightning ReflexesB

Skills Stealth +8 (+12 in water), Swim +19; Racial Modifiers +12 Stealth (+16 in water)

SQ swift reactions, winding

Breath Weapon (Su) A clockwork leviathan’s breath weapon is a powerful jet of scorching steam—it functions equally well above and under water.Grind (Ex) A clockwork leviathan deals an additional 1d8+16 points of slashing damage when it makes a successful grapple check because of the myriad twisting gears and churning pistons that make up its jagged underbelly.

Swallow Whole (Ex) A clockwork leviathan’s interior is filled with injurious grinding gears and superheated water – in addition to taking damage, a swallowed creature must hold its breath or risk drowning as long as it remains inside a clockwork leviathan’s ‘stomach.’

Environment any

Organization solitary or pod (2-4)

Treasure none

Clockwork leviathans are equally capable of functioning on land and in water. Sailors who are haunted by the memories of these treacherous machines need not exaggerate their yarns, for the reality of an aquatic construct such as this holds enough terror in its story for even the hardiest of seafarers.

A clockwork leviathan’s numerous metal plates and links are made of such resilient material that they never rust, even after long exposure to the briny sea waters that leviathans often patrol.

Clockwork leviathans are 25 feet long and weigh just over 3 tons.


When creating these clockworks, great care must be taken to waterproof their components. The creator must start with crafted clockwork pieces worth 10,000 gp.

Clockwork Leviathan

CL 12th; Price 130,000 gp

Construction Requirements Craft Construct, freedom of movement, geas/quest, heat metal, and limited wish, creator must be at least caster level 12th; Skill Craft (clockwork) DC 20; Cost 70,000 gp