Fortitude +25, Reflex +21, Will +21
Acrobatics +18, Athletics +26, Stealth +28
Darkvision
Actions & Abilities
Jaws
Damage: 3d10+14 Piercing
Tail
Damage: 2d10+14 Bludgeoning
Water Spout
Damage: 2d6+12 Bludgeoning
Undetectable
A sea serpent automatically tries to counteract any detection, revelation, or scrying divination attempted against it, using its modifier for its counteract modifier.
Capsize
The sea serpent attempts to capsize an aquatic vessel of its size or smaller that it's adjacent to. It must succeed at an check with a DC of 35 (reduced by 5 for each size smaller than the sea serpent) or the pilot's Sailing Lore DC, whichever is higher.
Constrict
(1d10+14)[bludgeoning],
Sea Serpent Algae
The water in the ballast organs around the sea serpent's neck is full of psychotropic algae.
Saving Throw
Maximum Duration 6 rounds
Stage 1 and, if flying, spends its first action each turn to descend 20 feet (1 round)
Stage 2 confused and, if flying, descends until reaching the ground or water below (1 round)
Spine Rake
The sea serpent extends the spines along its back and Swims or Strides. Each creature the serpent is adjacent to at any point during its movement takes (4d6+8)[slashing] damage ( save).
Swallow Whole
Huge, (2d10+6)[bludgeoning], Rupture 20
Grab
Creature Abilities
Undetectable. A sea serpent automatically tries to counteract any detection, revelation, or scrying divination attempted against it, using its modifier for its counteract modifier.
Capsize. The sea serpent attempts to capsize an aquatic vessel of its size or smaller that it's adjacent to. It must succeed at an check with a DC of 35 (reduced by 5 for each size smaller than the sea serpent) or the pilot's Sailing Lore DC, whichever is higher.
Constrict. (1d10+14)[bludgeoning],
Sea Serpent Algae. The water in the ballast organs around the sea serpent's neck is full of psychotropic algae.
Saving Throw
Maximum Duration 6 rounds
Stage 1 and, if flying, spends its first action each turn to descend 20 feet (1 round)
Stage 2 confused and, if flying, descends until reaching the ground or water below (1 round)
Spine Rake. The sea serpent extends the spines along its back and Swims or Strides. Each creature the serpent is adjacent to at any point during its movement takes (4d6+8)[slashing] damage ( save).
Swallow Whole. Huge, (2d10+6)[bludgeoning], Rupture 20
Source, license, and attribution
Source: Pathfinder Monster Core (remaster-core-2026-08-10)
This product is licensed under the ORC License located at the Library of Congress at TX 9-307-067 and available online at various locations. All warranties are disclaimed as set forth therein. Attribution: Pathfinder Monster Core (c) 2024, Paizo Inc.; Authors: Alexander Augunas, Dennis Baker, Kate Baker, Joshua Birdsong, Joseph Blomquist, Logan Bonner, Jason Bulmahn, James Case, John Compton, Paris Crenshaw, Adam Daigle, Darrin Drader, Brian Duckwitz, Robert N. Emerson, Scott Fernandez, Eleanor Ferron, Leo Glass, Matthew Goodall, BJ Hensley, Thurston Hillman, Vanessa Hoskins, James Jacobs, Jenny Jarzabski, Miko Kallio, Jason Keeley, Jeff Lee, Lyz Liddell, Luis Loza, Ron Lundeen, Robert G. McCreary, Philippe-Antoine Menard, Jacob W. Michaels, Dave Nelson, Jason Nelson, Tim Nightengale, Stephen Radney-MacFarland, Mikhail Rekun, Patrick Renie, Alex Riggs, David N. Ross, Michael Sayre, Mark Seifter, Chris S. Sims, Amber Stewart, Jeffrey Swank, William Thompson, Jason Tondro, Clark Valentine, Landon Winkler, Tonya Woldridge, and Linda Zayas-Palmer. Adaptation: Myth Meister PF2e Remaster Compendium, 2026. If you use this Adapted Licensed Material, please credit Myth Meister. The normalized rules records and rules-reference text in the Myth Meister PF2e Remaster Compendium are Adapted Licensed Material offered under the ORC License. Reserved Material in this product includes the Myth Meister name and logos, application source code, visual design and trade dress, and original campaign content. Pathfinder, Paizo, product logos, artwork, maps, trade dress, setting lore, characters, deities, locations, organizations, events, plots, and other Paizo Reserved Material are not included. Myth Meister is not affiliated with or endorsed by Paizo Inc. Expressly Designated Licensed Material: None.