Brontosaurus/Apatosaurus

A 40 ton plant-eater found near marshes and lakes. it spends much of its time in shallow water to support its bulk.

Originally Posted by Kain Darkwind of the Dicefreaks d20 Community.
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Brontosaurus meaning “thunder lizard” is a genus of gigantic quadruped sauropod dinosaurs.

Brontosaurus has a long, thin neck and a small head adapted for a herbivorous lifestyle; a bulky, heavy torso; and a long, whip-like tail. Adult individuals of Brontosaurus weigh up to 15 tonnes and measured up to 22 metres (72 ft) long.

As the archetypal sauropod, Brontosaurus is one of the best-known dinosaurs and has been featured in film, advertising, and postage stamps, as well as many other types of media.

Brontosaurus
Colossal animal
Hit Dice	30d8 + 303 (438 hp)
Initiative	+0
Speed	20 ft.
Armor Class	16 (+14 natural, -8 size), touch 2, flat-footed 16, combat 70
Base Attack/Combat	+22/+55
Attack	Tail +33 melee (4d8 + 29) or Power Attack tail +16 melee (4d8 + 54)
Space/Reach	30 ft./30 ft.
Special Attacks	Tail sweep, trample
Special Qualities	Low-Light Vision, Scent
Saves	Fort +28, Ref +11, Will +14
Abilities	Strength 46, Dexterity 10, Constitution 29, Intelligence 2, Wisdom 12, Charisma 10
Skills	Perception +27, Survival +17
Feats	Ability Focus (tail sweep), Awesome Blow, Cleave, Endurance, Great Fortitude, Greater Weapon Focus (tail), greater weapon specialization (tail), Improved Bull Rush, Iron Will, Power Attack, Run, Skill Focus (Perception), Skill Focus (Survival), Toughness, Weapon Focus (tail), Weapon Specialization (tail)
Climate/Terrain	Warm swamps
Organization	Solitary
Challenge Rating	13
Treasure	None
Alignment	Usually neutral
Advancement	31-60 HD (Colossal)

Tail Sweep (Ex): As a standard action, a brontosaurus can sweep a half-circle with a radius of 30 feet. Gargantuan and smaller creatures take 2d8 + 25 points of damage. (Reflex DC 44 half)

Trample: 4d12 + 25 damage, Reflex DC 42 half.