Sea Serpent

Spine-frilled neck arching up from the water like a snake ready to strike, this ship-sized serpent hisses a challenge.
 

Sea Serpent (CR 12)

Gargantuan Magical Beast (Aquatic)
Alignment: Neutral
Initiative: +6
Senses: Darkvision 120 feet, Low-Light Vision; Perception +8
  Speed: 20 feet, Swim 60 feet
Space: 20 feet
 

Defense

Armor Class: 25, touch 8, flat-footed 23 (+2 Dex, +17 natural, -4 size)
Hit Points: 187 (15d10+105)
Saving Throws: Fort +16, Ref +13, Will +7
elusive
Immunity: cold
Energy Resistance: fire 30
 

Offense

Melee: bite +23 (4d8+22/19-20 plus Grab), tail slap +18 (3d6+6 plus Grab)
Reach: 20 feet
  Special Attacks: Capsize, Constrict (3d6+18), Swallow Whole (4d8+18 bludgeoning damage, AC 18, hp 18)
 

Statistics

StrDexConIntWisCha
34 (+12) 14 (+2) 25 (+7) 2 (-4) 11 (+0) 11 (+0)
Base Attack Bonus: +15
CMB +31 (+35 Grapple)
CMD 43 (can't be tripped)
  Feats: Powerful Maneuvers, Improved Critical (bite), Improved Initiative, Iron Will, Lightning Reflexes, Skill Focus (Stealth), Stealthy
  Skills: Perception +8, Stealth +13, Swim +20
  Languages:
 

Special Abilities

Capsize (Ex)

A sea serpent can attempt to capsize a boat or ship of its size or smaller by ramming it as a charge attack and making a combat maneuver check. The DC of this check is 25 or the result of the boat captain's Profession (sailor) check, whichever is higher.

Elusive (Su)

Sea serpents have long been the stuff of maritime legends, but despite countless attempts to hunt them, they are rarely encountered unless they wish it. As a fullround action while in water, a sea serpent can move up to its run speed (300 ft.) without leaving any trace of its passing (identical in effect to a pass without trace). An elusive sea serpent gains a +40 circumstance bonus to its Stealth check. In addition, except when in combat, a sea serpent is considered to be under the effects of a nondetection spell. Both of these spell effects are at caster level 20th and cannot be dispelled.
 

Ecology

Environment: Any Oceans
Organization: solitary
Treasure: none

  Tales of immense sea serpents have colored the accounts of seagoing folk since the first ship sailed beyond sight of land. Yet proof of these immense and elusive creatures is remarkably difficult to come by, for not only is the ocean vast and the true sea serpent rare, but these creatures are quite adept at both avoiding capture and destroying ships bent on such a daunting task.
  Due to the sea serpent's hermitic nature, many sailors take to ascribing the sighting of such a beast to an omen, although whether the sighting portends peril or providence depends as much upon the ship's morale as it does anything else-the sea serpent itself has little interest in prophecy, and only its hunger determines how dangerous its proximity to a curious ship can be.
  Although sea serpents are little more than animals, they possess about them an air of mysticism that even old salts and cynics are forced to admit quickens the heart and buoys (or sinks) the spirit. Reports of sea serpent sightings are just as likely to encourage travel as they are to cause panic among seafarers, as explorers and adventurers flock to the site in hopes of sighting such a legendary creature.
  Typical sea serpents are 60 feet in length and weigh 4,500 pounds, but their upward size limit is unknown. Certainly, the sea is a vast and mysterious place more than capable of supporting whales and other such l e v i a t h a n s , and tales of sea serpents that exceed lengths of 300 feet or more are not unheard of. You can generate statistics for a sea serpent of such tremendous size by applying the advanced simple template or the giant simple template to the statistics presented here. Alternatively, you can advance this sea serpent to Colossal size, increasing its Hit Dice to 25 and its CR to 18.