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(Dinosaur) Argentinosaurus

Argentinosaurus, By Nobu Tamura ( - File:Argentinosaurus BW.jpg, CC BY 3.0,
By Nobu Tamura ( – File:Argentinosaurus BW.jpg, CC BY 3.0,

Argentinosaurus is a herbivorous sauropod dinosaur genus that was quite possibly the largest, heaviest land animal that ever lived.

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It developed on the island continent of South America during the middle of the Cretaceous Period (around 100 million years ago), after all of its more familiar Laurasian Jurassic kin – like Apatosaurus – had long disappeared.

Argentinosaurus’ measure between 115 to 150 feet long, stand about 50 feet tall, and weigh about 80 tons.

Colossal animal
Hit Dice32d8+323 (467 hp)
Speed30 ft. (6 squares)
Armor Class22 (-8 size, +20 natural), touch 2, flat-footed 22
Base Attack/Grapple+24/+57
AttackTail slam +23 melee (4d6+25 plus thunderous snap) or stamp (10d8+25)
Full AttackTail slam +23 melee (4d6+25 plus thunderous snap) or stamp (10d8+25)
Space/Reach80 ft./40 ft.
Special AttacksThunderous snap, trample 8d8+25
Special QualitiesLow-Light Vision, Scent
SavesFort +33, Ref +10, Will +12
AbilitiesStrength 44, Dexterity 10, Constitution 30, Intelligence 1, Wisdom 14, Charisma 10
SkillsListen +23, Spot +22
FeatsAlertness, Awesome Blow, Diehard, Endurance, Great Fortitude, Improved Bull Rush, Power Attack, Toughness
Climate/TerrainWarm forests, plains and hills
Challenge Rating17
AlignmentAlways neutral
Advancement33-78 HD (Colossal)
Level Adjustment


Thunderous Snap (Ex): Although an argentinosaurus is ponderous, its whip-like tail can move faster than sound. Any creature struck by an argentinosaurus’ tail slam must make a Fortitude save (DC 36) or be stunned for 1d4 rounds and deafened for 1d4 minutes. On a successful save, the creature is merely deafened for 1d4 minutes. The save DC is Constitution based.

Trample (Ex): An argentinosaurus can literally run over any creatures in its way that are of Gargantuan or smaller size. Creatures trampled must make a Reflex save (DC 43 half) or take 8d8+25 damage. The save DC is Strength-based.

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