Hit Dice: 7d8+ 56 (87 hp)
Speed: 40 ft. (8 squares)
AC: 18 (-1 size, -1 Dex, +10 natural), touch 8, flat-footed 18
Attacks: Head butt +11 melee
Damage: Head butt (1d6+10)
Face/Reach: 10 ft. /5 ft.
Special Attacks: Powerful charge, stun
Special Qualities: Low-light vision, scent
Saves: Fort +13, Ref +4, Will +2
Abilities: Str 25, Dex 8, Con 26, Int 2, Wis 10, Cha 14
Skills: Spot +10
Feats: Improved Bull Rush, Improved Overrun, Power Attack
Climate/Terrain: Temperate hills
Organization: Solitary, pair, or pack (4-12)
Challenge Rating: 6
Alignment: Always neutral
Advancement: 8-14 HD (Large);15-21 HD (Huge)
Level Adjustment: -
Although herbivores, pachycephalosauruses are notoriously bad-tempered and often attack without provocation.
These strange dinosaurs are often found dwelling in hills or badlands, where they travel in packs led by a dominant male. When two groups meet, the males in each pack invariably challenge each other to contests of dominance. These conflicts, in which two bull dinosaurs repeatedly charge at each other in an attempt to head butt the other into submission, generate thunderous cracking sounds that can be heard for miles.
A pachycephalosaurus is usually 15 feet long and usually weighs around 800 pounds.
A pachycephalosaurus incited to attack (often by something as minor as merely approaching within charging range) invariably starts Combat with a charge.
They usually attack once every other round, manoeuvring to set up a new charge on the off rounds.
Powerful Charge (Ex): When a pachycephalosaurus charges, its head butt attack deals 2d6+20 points of bludgeoning damage.
Stun (Ex): A creature that is critically hit by a pachycephalosaurus must make a successful DC 20 Fortitude save or be stunned for 1d4 rounds. This save DC is Strength-based.