Dinosaur, Apatosaurus (Brontosaurus)

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Colossal Animal


Hit Dice: 20d8+166 (256 hp)

Initiative: -1

Speed: 20ft (4 squares)

AC: 12 (-8 size, +10 natural), touch 2, flat-footed 12

Attacks: Tail slam +19 melee

Damage: Tail slam +19 melee (3d8+18 plus thunderous snap)

Face/Reach: 60ft/40ft

Special Attacks: Thunderous snap, trample 6d8+18

Special Qualities: Low-light vision, scent

Saves: Fort +23, Ref +12, Will +8

Abilities: Str 34, Dex 11, Con 27, Int 1, Wis 14, Cha 10

Skills: Listen +12, Spot +19

Feats: Alertness, Diehard, Endurance, Great Fortitude, Toughness (x2)

Climate/Terrain: Warm forests, plains and hills

Organization: Solitary or pair

Challenge Rating: 10

Treasure: None

Alignment: Always neutral

Advancement: 21-60 HD (Colossal)

Level Adjustment: -

This massive quadruped has a very long neck and tail, a horse-like head, a wrinkled, elephantine hide and a small row of colourful spines lining its back, like those of an iguana.

The apatosaurs are the most common species of sauropod, the unbelievably large long-necked dinosaurs.

Although they vary in size, most apatosaurs are between 70 and 80 feet in length. They are solitary, unlike their relatives Diplodocus and Seismosaurus. They feed on low-lying foliage with their long necks, and can rear up on their hind legs and tail to reach the tops of trees.


Apatosaurs are so large that they have few natural enemies, besides allosaurs and megalosaurs hunting in packs. If directly threatened, they lash out with their powerful tails, but are capable of merely walking over most opponents.

Thunderous Snap (Ex): Although they are ponderous, an apatosaurus’ whip-like tail can move faster than sound. Any creature struck by an apatosaurus’ tail slam must make a Fortitude save (DC 28) 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 apatosaurus can literally run over any creatures in its way that are of Gargantuan or smaller size. Creatures trampled must make a Reflex save (DC 32 half) or take 6d8+18 damage. The save DC is Strength based.