Hit Dice: 20d8+152 (242 hp)
Speed: 30 ft.
AC: 21 (-2 size, -2 Dex, +15 natural), touch 6,flat-footed 21
Attacks: Tail slam +24 melee
Damage: Tail slam (2d6+16/19-20)
Face/Reach: 15 ft. /10 ft.
Special Attacks: Toss
Special Qualities: Dorsal Plates, Lowlight Vision, Scent
Saves: Fort +21, Ref +10, Will +7
Abilities: Str 32, Dex 6, Con 24, Int 2, Wis 12, Cha 10
Skills: Listen +24
Feats: Great Fortitude, Improved Critical (tail slam), Run, Toughness (4)
Climate/Terrain: Warm plains
Organization: Solitary, pair, or herd (3-10)
Challenge Rating: 10
Alignment: Always neutral
Advancement: 21-30 HD (Huge); 31-50 HD (Gargantuan);51-60 HD (Colossal)
Level Adjustment: -
This territorial herbivore has few enemies, so potent are its defences. The stegosaurus wanders in small herds across steppes and plains, eating grasses and low bushes and berries. They are fiercely protective of their young, and so rarely back down from a fight. An average stegosaurus is about 30 feet long and typically weighs nearly a dozen tons.
Although they are herbivores, stegosauruses rarely flee from predator attacks. Rather, they fight back with shocking and brutal aggression, lashing at their enemies with their spiked tails and constantly moving to keep their dorsal plates between them and their attackers.
Toss (Ex): A creature that is at least two sizes smaller than the stegosaurus that is hit by the dinosaur’s tail slam must make a successful DC 31 Reflex saving throw or be thrown 30 feet in a random direction away from the stegosaurus. The creature takes 1d6 points of damage from being tossed plus an additional 1d6 points of damage if it strikes a solid object before it travels the full distance. The save DC is Strength-based.
Dorsal Plates (Ex): As a move action, a stegosaurus can lower its body to place its dorsal plates between it and a single creature. This grants the stegosaurus a +4 armour bonus to its Armour Class against the chosen creature. Additionally, if the chosen creature attacks the stegosaurus with a light weapon or a natural weapon, the sharp dorsal plates inflict 1d10 points of slashing damage; a successful DC 18 Reflex saving throw halves this damage. The save DC is Dexterity-based.