Sea Serpent, Crested, Very old (CR 18)
Huge Dragon (Water)
Alignment: Usually neutral evil
Initiative: +2 (Dex)
AC: 35 (-4 size, +2 Dex, +27 natural), touch 8, flat-footed 33
Hit Dice: 29d12+232 (420 hp); DR: 15/magic
Fort +24, Ref +18, Will +20
Speed: 40 ft., swim 100 ft.
Space: 20 ft./10 ft.
Base Attack +28; Grapple +52
Attack: 1 bite +36, 2 claws +31, 1 tail slap +31
Damage: 1 bite 2d8+11, 2 claws 2d6+5, 1 tail slap 2d6
Special Attacks/Actions: Breath weapon 9d6 (32), Constrict, Improved Grab, Swallow Whole
Abilities: Str 33, Dex 14, Con 27, Int 14, Wis 19, Cha 28
Special Qualities: Amphibious, hypnotism, Charm person, Dispel Magic, Charm Monster, Suggestion, SR 23, Fear aura (DC 33), Crest Harmonics (CL 29)
Feats: #Feats: 10
Skills:
Class Skills: Bluff, Diplomacy, Perform(crest harmonics), and Skill points: 64
Advancement: 30-31 HD
Climate/Terrain: Temperate Aquatic
Organization: Solitary (1 dragon, any age), clutch (1d4+1 wyrmlings, very young, young, juvenile, or young adults), family (pair of mature adults and 1d4+1 offspring)
Treasure/Possessions: Double standard
Source:
Dragon #345
Amphibious (Ex): Sea serpents can breathe air as easily as they breathe water.
Constrict (Ex): A sea serpent of Medium size or larger deals damage with a successful grapple check. The amount of damage dealt depends upon the creature's size, as indicated on the following chart. The sea serpent adds 1-1/2 times its Strength bonus on damage rolls made to constrict.
| Size | Constrict Damage |
| Medium | 1d8 |
| Large | 2d8 |
| Gargantuan | 4d8 |
| Colossal | 6d8 |
Unlike their dragon kin, crested sea serpents prefer to lure their prey into traps. Using suggestion to trick a ship's pilot into smashing his ship on submerged rocks is a favored tactic, as is using thralls to do the fighting for them.
Improved Grab (Ex): To use this ability, the sea serpent must hit with its bite or tail slap attacks. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins a grapple check, it establishes a hold. If it gets a hold with its bite it can attempt to swallow the foe the following round. If it gets a hold with its tail slap it can constrict.
Swallow Whole (Ex): A sea serpent can attempt to swallow an opponent at least two size categories smaller than itself by making a successful grapple check. Once inside, the opponent takes bite damage plus 1d8 points of acid damage every round from the serpent's digestive tract. A swallowed creature can attempt to cut its way out by using a light slashing or piercing weapon to deal 3 points of damage per age category of the sea serpent to its digestive tract (AC 15). Once the creature exits, muscular action closes the hole; other swallowed opponents must cut their own ways out.
A sea serpent's digestive tract can hold up to one opponent of two size categories smaller than itself and four times as many of each size category below that. For example, a Huge sea serpent's digestive tract can hold 1 Medium, 4 Small, 16 Tiny, or 64 Diminutive or smaller opponents.
Breath Weapon (Su): A crested sea serpent has one kind of breath weapon, a line of sonic energy. Creatures caught in the line of sonic energy receive a Reflex save for half damage.
Spell-Like Abilities: At will - hypnotism, suggestion; 3/day - charm person, charm monster, dispel magic. These abilities are all as cast by a bard of level equal to the sea serpent's hit dice. The save DC, however, is equal to a Perform (crest harmonics) skill check made by the crested sea serpent when the spell is cast.
Skills: Bluff, Diplomacy, and Perform (crest harmonics) are considered class skills for crested sea serpents.
Water Subtype
This subtype usually is used for elementals and outsiders with a connection to the Elemental Plane of Water. Creatures with the water subtype always have swim speeds and can move in water without making Swim checks. A water creature can breathe underwater and usually can breathe air as well.