Home >Game Mastering >Bestiary >Creatures by Type >Constructs >Clockwork >

Clockwork Leviathan

Clockwork Leviathan CR 12

Long and metallic, this serpentine construct resembles a massive mechanical eel with paddlelike limbs.

XP 19,200
N Huge construct (hybrid)
Init +9; Senses darkvision 60 ft, low-light vision; Perception +10


EAC 26; KAC 28
Fort +12, Ref +16, Will +9
Defensive Abilities DR 5/adamantine; Immunities construct traits; Weaknesses vulnerable to electricity


Speed 30 ft, swim 60 ft
Melee bite +25 (6d4+20 P)
Multiattack bite +19 (3d6+20 P), 2 slams +19 (3d6+20 B plus grab)
Space 15 ft; Reach 15 ft
Offensive Abilities breath weapon (60 ft. Line“>line, 6d4+12 F, DC 18 for half, usable every 1d4 rounds), grind, swallow whole


Str +8, Dex +5, Con -, Int -, Wis +4, Cha -4
Skills Athletics +27, Stealth +5 (+ 21 in water), Survival +21
Languages Common (cannot speak any language)
Other Abilities mindless, 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 combat maneuver, 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.” Sealed armor or a space suit negates this.

Swift Reactions (Ex)

Clockwork constructs gain Lightning Reflexes and Improved Initiative as bonus feats.


Environment any
Organization solitary or pod (2-4)

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.

Section 15: Copyright Notice

Alien Bestiary (Starfinder) © 2018, Legendary Games; Lead Designer: Jason Nelson. Authors: Anthony Adam, Kate Baker, John Bennet, Eytan Bernstein, Robert Brookes, Russ Brown, Duan Byrd, Jeff Dahl, Robyn Fields, Joel Flank, Matt Goodall, Robert J. Grady, Jim Groves, Steven T. Helt, Thurston Hillman, Tim Hitchcock, Nick Hite, Daniel Hunt, Mike Kimmel Marshall, Isabelle Lee, Jeff Lee, Lyz Liddell, Jason Nelson, Richard Pett, Tom Phillips, Alistair J. Rigg, Alex Riggs, Wendall Roy, Mike Shel, Neil Spicer, Todd Stewart, Russ Taylor, Rachel Ventura, Mike Welham, George Loki Williams, Scott Young.