Dinosaur, Elasmosaurus

Has a thick, ovoid body with fins instead of legs and a long, snaky tail and neck. Though it resides primarily in the water, an elasmosaurus only breathes air. An elasmosaurus has a total length of some 30 feet, including a tail half as long as its entire body, and weighs about 5,000 pounds. Observers who see only its head or tail might easily mistake it for a massive snake.

Source(s) 3.5E Monster Manual I, 3E Monster Manual I, Forgotten Realms (MC3), 1E Monster Manual 1, Monstrous Manual

Elasmosaurus
Huge animal
Hit Dice	10d8+66 (111 hp)
Initiative	+2
Speed	20 ft. (4 squares), Swim 50 ft.
Armor Class	13 (-2 size, +2 Dexterity, +3 natural), touch 10, flat-footed 11
Base Attack/Grapple	+7/+23
Attack	Bite +13 melee (2d8+12)
Full Attack	Bite +13 melee (2d8+12)
Space/Reach	15 ft./10 ft.
Special Attacks	–
Special Qualities	Low-Light Vision, Scent
Saves	Fort +15, Ref +9, Will +4
Abilities	Strength 26, Dexterity 14, Constitution 22, Intelligence 2, Wisdom 13, Charisma 9
Skills	Hide -4*, Listen +4, Spot +9, Swim +16
Feats	Dodge, Great Fortitude, Toughness (2)
Environment	Warm aquatic
Organization	Solitary, pair, or herd (5-8)
Challenge Rating	7
Treasure	None
Alignment	Always neutral
Advancement	11-20 HD (Huge); 21-30 HD (Gargantuan)
Level Adjustment	–

Combat

An elasmosaurus is aggressive and attacks anything it notices. The creature is strong, fast, and highly maneuverable, able to turn quickly and lunge at prey. When hunting, it travels with its head out of the water, snapping down quickly to seize prey.

Skills *An elasmosaurus has a +8 racial bonus on Hide checks in water.